2021 NZART pool
578 / 600 questions need explanations
All explanations are written and maintained by ordinary users like you! Please help us finish the explanations in this pool.
In the block marked regulator in the diagram below, a reversed diode may be present across the regulator. Its job is to
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Block negative voltages from appearing at the output (62% chose this)
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Blow a fuse if high voltages occur at the output (21% chose this)
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Blow a fuse if negative currents occur at the output (10% chose this)
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Bypass the regulator for higher voltage at its output compared to its input (7% chose this)
In the block diagram shown, the "low pass filter" must be rated to
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carry the full power output from the station (15% chose this)
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filter out higher-frequency modulation components for maximum intelligibility (65% chose this)
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filter out high-amplitude sideband components (20% chose this)
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emphasise low-speed Morse code output (0% chose this)
An attenuator network comprises two 100 ohm resistors in series with the input applied across both resistors and the output taken from across one of them. The voltage attenuation of the network is
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3 dB (32% chose this)
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6 dB (14% chose this)
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50 dB (46% chose this)
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100 dB (7% chose this)
The type of rectifier diode in almost exclusive use in power supplies is
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lithium (6% chose this)
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germanium (63% chose this)
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silicon (25% chose this)
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copper-oxide (6% chose this)
The input to an amplifier is 1 volt rms and the output 10 volt rms. This is an increase of
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3 dB (12% chose this)
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6 dB (19% chose this)
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10 dB (50% chose this)
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20 dB (19% chose this)
In the transmitter block diagram shown, the "mixer"
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adds the correct proportion of carrier to the SSB signal (18% chose this)
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mixes the audio and RF signals in the correct proportions (59% chose this)
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translates the SSB signal to the required frequency (23% chose this)
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mixes the two sidebands in the correct proportions (0% chose this)
A distant amplitude-modulated station is heard quite loudly but the modulation is at times severely distorted. A similar local station is not affected. The probable cause of this is
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transmitter malfunction (8% chose this)
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selective fading (21% chose this)
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a sudden ionospheric disturbance (58% chose this)
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front end overload (13% chose this)
Because of high absorption levels at frequencies below 4 MHz during daylight hours, only high angle signals are normally reflected back by this layer
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C (4% chose this)
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D (31% chose this)
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E (19% chose this)
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F (46% chose this)
All communications frequencies throughout the spectrum are affected in varying degrees by the
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atmospheric conditions (39% chose this)
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ionosphere (33% chose this)
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aurora borealis (0% chose this)
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sun (28% chose this)
In the transmitter block diagram shown, the "filter"
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removes mains hum from the audio signal (0% chose this)
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suppresses unwanted harmonics of the RF signal (45% chose this)
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removes one sideband from the modulated signal (27% chose this)
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removes the carrier component from the modulated signal (27% chose this)
A varactor diode acts like a variable
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resistor (20% chose this)
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voltage regulator (40% chose this)
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capacitor (30% chose this)
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inductor (10% chose this)
The purpose of a balanced modulator in a SSB transmitter is to
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make sure that the carrier and both sidebands are in phase (30% chose this)
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make sure that the carrier and both sidebands are 180 degrees out of phase (5% chose this)
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ensure that the percentage of modulation is kept constant (35% chose this)
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suppress the carrier while producing two sidebands (30% chose this)
A half wave antenna cut for 7 MHz can be used on this band without change
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10 metre (14% chose this)
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15 metre (29% chose this)
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20 metre (43% chose this)
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80 metre (14% chose this)
A communication receiver may have several IF filters of different bandwidths. The operator selects one to
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improve the S-meter readings (0% chose this)
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improve the receiver sensitivity (67% chose this)
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improve the reception of different types of signal (33% chose this)
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increase the noise received (0% chose this)
The signal from a balanced modulator consists of
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a carrier and two sidebands (41% chose this)
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a carrier and one sideband (28% chose this)
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no carrier and two sidebands (24% chose this)
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no carrier and one sideband (7% chose this)
A noise blanker on a receiver is most effective to reduce
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50 Hz power supply hum (4% chose this)
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noise originating from the mixer stage of the receiver (26% chose this)
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ignition noise (26% chose this)
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noise originating from the RF stage of the receiver. (44% chose this)
A superhet receiver for SSB reception has an insertion oscillator to
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replace the suppressed carrier for detection (30% chose this)
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phase out the unwanted sideband signal (13% chose this)
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reduce the passband of the IF stages (26% chose this)
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beat with the received carrier to produce the other sideband (30% chose this)
The power delivered to an antenna is 500 watt. The effective antenna resistance is 20 ohm. The antenna current is
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25 amp (59% chose this)
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2.5 amp (9% chose this)
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10 amp (12% chose this)
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5 amp (21% chose this)
Selectivity in a superhet receiver is achieved primarily in the
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RF amplifier (25% chose this)
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Mixer (35% chose this)
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IF amplifier (35% chose this)
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Audio stage (5% chose this)
The input to an amplifier is 1 volt rms and output 100 volt rms. This is an increase of
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10 dB (35% chose this)
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20 dB (30% chose this)
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40 dB (30% chose this)
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100 dB (4% chose this)
In the transmitter block diagram shown, the "power amplifier"
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need not have linear characteristics (39% chose this)
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amplifies the bandwidth of its input signal (33% chose this)
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must be adjusted during key-up conditions (22% chose this)
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should be water-cooled (6% chose this)
A double conversion receiver designed for SSB reception has a carrier insertion oscillator and
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one IF stage and one local oscillator (38% chose this)
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two IF stages and one local oscillator (29% chose this)
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two IF stages and two local oscillators (29% chose this)
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two IF stages and three local oscillators (4% chose this)
An attenuator network has 10 volt rms applied to its input with 5 volt rms measured at its output. The attenuation of the network is
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6 dB (39% chose this)
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10 dB (22% chose this)
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20 dB (39% chose this)
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40 dB (0% chose this)
The approximate physical length of a half-wave antenna for a frequency of 1000 kHz is
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300 metres (21% chose this)
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600 metres (8% chose this)
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150 metres (29% chose this)
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30 metres (42% chose this)
Cross-modulation is usually caused by
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rectification of strong signals in overloaded stages (28% chose this)
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key-clicks generated at the transmitter (4% chose this)
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improper filtering in the transmitter (28% chose this)
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lack of receiver sensitivity and selectivity (40% chose this)
In the transmitter block diagram shown, the "driver buffer"
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filters any sharp edges from the input signal (35% chose this)
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drives the power amplifier into saturation (9% chose this)
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provides isolation between the oscillator and power amplifier (35% chose this)
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changes the frequency of the master oscillator signal (22% chose this)
When measuring the current drawn by a receiver from a power supply, the current meter should be placed
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in parallel with both receiver power supply leads (23% chose this)
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in parallel with one of the receiver power leads (5% chose this)
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in series with both receiver power leads (36% chose this)
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in series with one of the receiver power leads (36% chose this)
The standard frequency offset (split) for 2 metre repeaters in New Zealand is
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plus 600 kHz above 147 MHz, minus 600 kHz on or below 147 MHz (35% chose this)
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plus 600 kHz below 147 MHz, minus 600 kHz on or above 147 MHz (22% chose this)
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minus 5 MHz below 147 MHz, plus 5 MHz kHz on or above 147 MHz (26% chose this)
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plus 5 MHz below 147 MHz, minus 5 MHz kHz on or above 147 MHz (17% chose this)
One of the ionospheric layers splits into two parts during the day called
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A & B (5% chose this)
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D1 & D2 (32% chose this)
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E1 & E2 (27% chose this)
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F1 & F2 (36% chose this)
In the figure shown, 3 represents the
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source of an n-channel junction FET (23% chose this)
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gate of a p-channel junction FET (35% chose this)
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emitter of a pnp transistor (12% chose this)
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drain of an n-channel junction FET (31% chose this)
The voltage applied to two resistors in series is doubled. The total power dissipated will
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increase by four times (36% chose this)
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decrease to half (27% chose this)
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double (23% chose this)
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not change (14% chose this)
The standard frequency offset (split) for 70 cm repeaters in New Zealand is plus or minus
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600 kHz (64% chose this)
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1 MHz (0% chose this)
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2 MHZ (4% chose this)
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5 MHz (32% chose this)
Radio wave energy on frequencies below 4 MHz during daylight hours is almost completely absorbed by this ionospheric layer
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C (5% chose this)
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D (38% chose this)
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E (24% chose this)
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F (33% chose this)
In the block diagram of the receiver shown, most of the receiver gain is in the
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RF amplifier (46% chose this)
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IF amplifier (29% chose this)
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AF amplifier (25% chose this)
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mixer (0% chose this)
An advantage of a double conversion receiver is that it
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does not drift off frequency (28% chose this)
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produces a louder audio signal (0% chose this)
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has improved image rejection characteristics (28% chose this)
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is a more sensitive receiver (45% chose this)
Three 18 ohm resistors are connected in parallel across a 12 volt supply. The total power dissipation of the resistor load is
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3 watt (36% chose this)
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18 watt (14% chose this)
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24 watt (36% chose this)
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36 watt (14% chose this)
The following band is allocated to New Zealand amateur radio operators on a primary basis
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3.5 to 3.9 MHz (26% chose this)
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10.1 to 10.15 MHz (10% chose this)
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146 to 148 MHz (39% chose this)
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21 to 21.45 MHz (26% chose this)
The tuning control of a superhet receiver changes the tuned frequency of the
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audio amplifier (10% chose this)
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IF amplifier (52% chose this)
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local oscillator (38% chose this)
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post-detector amplifier (0% chose this)
An rms-reading voltmeter is used to measure a 50 Hz sinewave of known peak voltage 14 volt. The meter reading will be about
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14 volt (30% chose this)
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28 volt (25% chose this)
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10 volt (40% chose this)
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50 volt (5% chose this)
An operational amplifier connected as a filter always utilises
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positive feedback to reduce oscillation (48% chose this)
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negative feedback (28% chose this)
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random feedback (3% chose this)
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inductors and resistor circuits only (21% chose this)
Transmitter power amplifiers can generate parasitic oscillations on
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the transmitter's output frequency (4% chose this)
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harmonics of the transmitter's output frequency (57% chose this)
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frequencies unrelated to the transmitter's output frequency (35% chose this)
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VHF frequencies only (4% chose this)
The ionisation level of the ionosphere reaches its minimum
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just after sunset (31% chose this)
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just before sunrise (31% chose this)
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at noon (27% chose this)
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at midnight (12% chose this)
Insulators are used at the end of suspended antenna wires to
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increase the effective antenna length (4% chose this)
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limit the electrical length of the antenna (39% chose this)
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make the antenna look more attractive (4% chose this)
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prevent any loss of radio waves by the antenna (52% chose this)
In the block diagram of the receiver shown, an automatic gain control (AGC) circuit would be associated with the
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Speaker (11% chose this)
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IF amplifier (47% chose this)
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RF filter (42% chose this)
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Oscillator (0% chose this)
An inductor and a capacitor are connected in parallel. At the resonant frequency the resulting impedance is
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maximum (33% chose this)
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minimum (48% chose this)
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totally reactive (15% chose this)
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totally inductive (4% chose this)
An isolating transformer is used to
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ensure that faulty equipment connected to it will blow a fuse in the distribution board (17% chose this)
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ensure that no voltage is developed between either output lead and ground (38% chose this)
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ensure that no voltage is developed between the output leads (13% chose this)
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step down the mains voltage to a safe value (33% chose this)
The reactance of a capacitor increases as the
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frequency increases (32% chose this)
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frequency decreases (29% chose this)
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applied voltage increases (26% chose this)
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applied voltage decreases (13% chose this)
An antenna with 20 metres of wire each side of a centre insulator will be resonant at approximately
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3600 kHz (35% chose this)
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3900 kHz (15% chose this)
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7050 kHz (19% chose this)
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7200 kHz (31% chose this)
A quarter-wave length of 50-ohm coaxial line is shorted at one end. The impedance seen at the other end of the line is
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zero (30% chose this)
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5 ohm (17% chose this)
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150 ohm (13% chose this)
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infinite (39% chose this)
Parasitic oscillations in the RF power amplifier stage of a transmitter may occur
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at low frequencies only (4% chose this)
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on harmonic frequencies (54% chose this)
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at high frequencies only (4% chose this)
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at high or low frequencies (38% chose this)
An inductor and a capacitor form a resonant circuit. If the value of the inductor is decreased by a factor of four, the resonant frequency will
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increase by a factor of four (13% chose this)
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increase by a factor of two (38% chose this)
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decrease by a factor of two (33% chose this)
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decrease by a factor of four (17% chose this)
In the figure shown, 2 represents the
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drain of a p-channel junction FET (5% chose this)
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collector of an npn transistor (11% chose this)
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gate of an n-channel junction FET (47% chose this)
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base of a pnp transistor (37% chose this)
A resistor with 10 volt applied across it and passing a current of 1 mA has a value of
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10 ohm (14% chose this)
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100 ohm (14% chose this)
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1 kilohm (29% chose this)
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10 kilohm (43% chose this)
A fullwave DC power supply operates from the New Zealand AC mains. The ripple frequency is
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25 Hz (5% chose this)
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50 Hz (55% chose this)
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70 Hz (16% chose this)
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100 Hz (24% chose this)
A stage in a receiver with input and output circuits tuned to the received frequency is the
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RF amplifier (36% chose this)
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local oscillator (32% chose this)
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audio frequency amplifier (20% chose this)
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detector (12% chose this)
A 20 ohm resistor carries a current of 0.25 ampere. The power dissipated is
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1.25 watt (45% chose this)
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5 watt (45% chose this)
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2.50 watt (5% chose this)
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10 watt (5% chose this)
The "National System" is
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the legal licensing standard of Amateur operation in New Zealand (26% chose this)
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a series of nationwide amateur radio linked repeaters in the 70 cm band (43% chose this)
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the official New Zealand repeater band plan (4% chose this)
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A nationwide emergency communications procedure (26% chose this)
The signal from an amplitude modulated transmitter consists of
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a carrier and two sidebands (59% chose this)
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a carrier and one sideband (18% chose this)
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no carrier and two sidebands (18% chose this)
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no carrier and one sideband (6% chose this)
A circuit has a total resistance of 100 ohm and 50 volt is applied across it. The current flow will be
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50 mA (20% chose this)
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500 mA (33% chose this)
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2 ampere (37% chose this)
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20 ampere (10% chose this)
A current of 10 ampere rms at a frequency of 50 Hz flows through a 100 ohm resistor. The power dissipated is
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500 watt (39% chose this)
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707 watt (21% chose this)
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10,000 watt (36% chose this)
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50,000 watt (4% chose this)
An active audio low-pass filter could be constructed using
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zener diodes and resistors (21% chose this)
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electrolytic capacitors and resistors (39% chose this)
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an operational amplifier, resistors and capacitors (36% chose this)
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a transformer and capacitors (4% chose this)
The following amateur radio band is shared with another service in New Zealand
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51 to 54 MHz (33% chose this)
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144 to 146 MHz (23% chose this)
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7.0 to 7.1 MHz (17% chose this)
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24.89 to 24.99 MHz (27% chose this)
The polarisation of an electromagnetic wave is defined by the direction of
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the H field (4% chose this)
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propagation (33% chose this)
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the E field (42% chose this)
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the receiving antenna (21% chose this)
A repeater operating with a "positive 600 kHz split"
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listens on a frequency 600 kHz higher than its designated frequency (40% chose this)
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transmits on a frequency 600 kHz higher than its designated frequency (36% chose this)
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transmits simultaneously on its designated frequency and one 600 kHz higher (20% chose this)
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uses positive modulation with a bandwidth of 600 kHz (4% chose this)
Before re-issuing, a relinquished callsign is normally kept for
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1 year (31% chose this)
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2 years (31% chose this)
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0 years (0% chose this)
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5 years (38% chose this)
In the figure shown, 1 represents the
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collector of a pnp transistor (41% chose this)
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gate of a junction FET (9% chose this)
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source of a MOSFET (5% chose this)
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emitter of a pnp transistor (45% chose this)
Zener diodes are normally used as
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RF detectors (16% chose this)
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AF detectors (11% chose this)
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current regulators (21% chose this)
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voltage regulators (53% chose this)
An attenuator network has 10 volt rms applied to its input with 1 volt rms measured at its output. The attenuation of the network is
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6 dB (14% chose this)
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10 dB (52% chose this)
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20 dB (34% chose this)
-
40 dB (0% chose this)
The impedance at the feed point of a folded dipole antenna is approximately
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300 ohm (40% chose this)
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150 ohm (20% chose this)
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200 ohm (4% chose this)
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100 ohm (36% chose this)
A semiconductor with leads labelled gate, drain and source, is best described as a
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bipolar transistor (39% chose this)
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silicon diode (0% chose this)
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gated transistor (17% chose this)
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field-effect transistor (43% chose this)
The stage in a superhet receiver with a tuneable input and fixed tuned output is the
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RF amplifier (10% chose this)
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mixer stage (50% chose this)
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IF amplifier (10% chose this)
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local oscillator (30% chose this)
The distance from the far end of the ground wave to the nearest point where the sky wave returns to the earth is called the
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skip distance (59% chose this)
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radiation distance (0% chose this)
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skip angle (7% chose this)
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skip zone (34% chose this)
A power supply is to power a solid-state transceiver. A suitable over-voltage protection device is a
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crowbar across the regulator output (40% chose this)
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100 uF capacitor across the transformer output (8% chose this)
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fuse in parallel with the regulator output (20% chose this)
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zener diode in series with the regulator (32% chose this)
Two bands where amateur satellites may operate are
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28.0 to 29.7 MHz and 144.0 to 146.0 MHz (48% chose this)
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21.0 to 21.1 MHz and 146.0 to 148.0 MHz (30% chose this)
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3.5 to 3.8 MHz and 7.0 to 7.1 MHz (4% chose this)
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7.1 to 7.3 MHz and 10.1 to 10.15 MHz (17% chose this)
In the FM communications receiver shown in the block diagram, the "filter" bandwidth is typically
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3 kHz (32% chose this)
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10 kHz (58% chose this)
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64 kHz (5% chose this)
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128 kHz (5% chose this)
This property of an antenna broadly defines the range of frequencies to which it will be effective
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bandwidth (55% chose this)
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front-to-back ratio (15% chose this)
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impedance (15% chose this)
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polarisation (15% chose this)
Morse code is usually transmitted by radio as
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an interrupted carrier (55% chose this)
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a voice modulated carrier (0% chose this)
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a continuous carrier (35% chose this)
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a series of clicks (10% chose this)
The block marked 'Transformer' in the diagram is to
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transform the incoming mains AC voltage to a DC voltage (60% chose this)
-
ensure that any RF radiation cannot get into the power supply (0% chose this)
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transform the mains AC voltage to a more convenient AC voltage (37% chose this)
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transform the mains AC waveform into a higher frequency waveform (3% chose this)
An audio amplifier is necessary in an AM receiver because
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signals leaving the detector are weak (52% chose this)
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the carrier frequency must be replaced (5% chose this)
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the signal requires demodulation (10% chose this)
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RF signals are not heard by the human ear (33% chose this)
To obtain high frequency stability in a transmitter, the VFO should be
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run from a non-regulated AC supply (14% chose this)
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in a plastic box (5% chose this)
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powered from a regulated DC supply (52% chose this)
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able to change frequency with temperature (29% chose this)
A band-stop filter will
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pass frequencies each side of a band (37% chose this)
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stop frequencies each side of a band (50% chose this)
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only allow one spot frequency through (10% chose this)
-
pass frequencies below 100 MHz (3% chose this)
In the block diagram of the receiver shown, the selectivity would be set by the
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AF amplifier (22% chose this)
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mixer (33% chose this)
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limiter (4% chose this)
-
filter (41% chose this)
The block marked 'Regulator' in the diagram could consist of
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four silicon power diodes in a regulator configuration (39% chose this)
-
two silicon power diodes and a centre-tapped transformer (15% chose this)
-
a three-terminal regulator chip (33% chose this)
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a single silicon power diode connected as a half-wave rectifier (12% chose this)
The current in a 100 kilohm resistor is 10 mA. The power dissipated is
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1 watt (24% chose this)
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10 watt (44% chose this)
-
100 watt (8% chose this)
-
10,000 watt (24% chose this)
The value of a resistor to drop 100 volt with a current of 0.8 milliampere is
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125 ohm (45% chose this)
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125 kilohm (38% chose this)
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1250 ohm (3% chose this)
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1.25 kilohm (14% chose this)
The antenna in this diagram has two equal lengths of wire shown as 'X' forming a dipole between insulators. The optimum operating frequency will be when the
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length X+X equals the signal wavelength (43% chose this)
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dimensions are changed with one leg doubled in length (5% chose this)
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length X+X is a little shorter than one-half of the signal wavelength (52% chose this)
-
antenna has one end grounded (0% chose this)
Three 15 picofarad capacitors are wired in parallel. The value of the combination is
-
45 picofarad (55% chose this)
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18 picofarad (0% chose this)
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12 picofarad (15% chose this)
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5 picofarad (30% chose this)
A current of 500 milliamp passes through a 1000 ohm resistance. The power dissipated is
-
0.25 watt (26% chose this)
-
2.5 watt (11% chose this)
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25 watt (22% chose this)
-
250 watt (41% chose this)
The BFO in a superhet receiver operates on a frequency nearest to that of its
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RF amplifier (7% chose this)
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audio amplifier (7% chose this)
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local oscillator (44% chose this)
-
IF amplifier (41% chose this)
The following transmission mode is usually demodulated by a product detector
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pulse modulation (8% chose this)
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double sideband full carrier modulation (16% chose this)
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frequency modulation (32% chose this)
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single sideband suppressed carrier modulation (44% chose this)
The reflector and director(s) in a Yagi antenna are called
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oscillators (0% chose this)
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tuning stubs (19% chose this)
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parasitic elements (42% chose this)
-
matching units (38% chose this)
An interfering signal from a transmitter has a frequency of 57 MHz. This signal could be the
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seventh harmonic of an 80 meter transmission (12% chose this)
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third harmonic of a 15 metre transmission (12% chose this)
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second harmonic of a 10 metre transmission (44% chose this)
-
crystal oscillator operating on its fundamental (32% chose this)
At the ends of a half-wave dipole the
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voltage and current are both high (4% chose this)
-
voltage is high and current is low (46% chose this)
-
voltage and current are both low (29% chose this)
-
voltage low and current is high (21% chose this)
The input impedance of an operational amplifier is generally
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very high (48% chose this)
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very low (39% chose this)
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capacitive (0% chose this)
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inductive (13% chose this)
To receive Morse code signals, a BFO is employed in a superhet receiver to
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produce IF signals (4% chose this)
-
beat with the local oscillator signal to produce sidebands (26% chose this)
-
produce an audio tone to beat with the IF signal (22% chose this)
-
beat with the IF signal to produce an audio tone (48% chose this)
The characteristic impedance of a transmission line is determined by the
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length of the line (38% chose this)
-
load placed on the line (0% chose this)
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physical dimensions and relative positions of the conductors (42% chose this)
-
frequency at which the line is operated (19% chose this)
When the signal from a transmitter overloads the audio stages of a broadcast receiver, the transmitted signal
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can be heard irrespective of where the receiver is tuned (43% chose this)
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appears only when a broadcast station is received (7% chose this)
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is distorted on voice peaks (46% chose this)
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appears on only one frequency (4% chose this)
An isotropic antenna is a
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half wave reference dipole (32% chose this)
-
infinitely long piece of wire (16% chose this)
-
dummy load (4% chose this)
-
hypothetical point source (48% chose this)
Any length of transmission line may be made to appear as an infinitely long line by
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shorting the line at the end (17% chose this)
-
leaving the line open at the end (33% chose this)
-
terminating the line in its characteristic impedance (40% chose this)
-
increasing the standing wave ratio above unity (10% chose this)
The power dissipation of a resistor carrying a current of 10 mA with 10 volt across it is
-
0.01 watt (17% chose this)
-
0.1 watt (41% chose this)
-
1 watt (34% chose this)
-
10 watt (7% chose this)
The signal from a frequency modulated transmitter has
-
an amplitude which varies with the modulating waveform (14% chose this)
-
a frequency which varies with the modulating waveform (57% chose this)
-
a single sideband which follows the modulating waveform (10% chose this)
-
no sideband structure (19% chose this)
If broadband noise interference varies when it rains, the most likely cause could be from
-
underground power cables (4% chose this)
-
outside overhead power lines (46% chose this)
-
car ignitions (4% chose this)
-
your antenna connection (46% chose this)
"Break-in keying" means
-
unauthorised entry has resulted in station equipment disappearing (0% chose this)
-
temporary emergency operating (19% chose this)
-
key-down changes the station to transmit, key-up to receive (46% chose this)
-
the other station's keying is erratic (35% chose this)
The following amateur radio band is shared with other services
-
14.0 to 14.35 MHz (20% chose this)
-
7.2 to 7.3 MHz (40% chose this)
-
18.068 to 18.168 MHz (13% chose this)
-
144.0 to 146.0 MHz (27% chose this)
A General Amateur Operator Certificate of Competency authorises the use of
-
all amateur radio transmitting and receiving apparatus (57% chose this)
-
a TV receiver (0% chose this)
-
amateur radio transmitting apparatus only (43% chose this)
-
marine mobile equipment (0% chose this)
An inductor and a capacitor are connected in series. At the resonant frequency the resulting impedance is
-
maximum (20% chose this)
-
minimum (60% chose this)
-
totally reactive (10% chose this)
-
totally inductive (10% chose this)
Harmonics are produced when
-
a resonant circuit is detuned (15% chose this)
-
negative feedback is applied to an amplifier (20% chose this)
-
a transistor is biased for class A operation (5% chose this)
-
a sine wave is distorted (60% chose this)
The frequency limits of the �15 metre band� are
-
21.00 to 21.35 MHz (32% chose this)
-
21.00 to 21.40 MHz (13% chose this)
-
21.00 to 21.45 MHz (39% chose this)
-
21.00 to 21.50 MHz (16% chose this)
The current in an AC circuit completes a cycle in 0.1 second. So the frequency is
-
1 Hz (9% chose this)
-
10 Hz (52% chose this)
-
100 Hz (35% chose this)
-
1000 Hz (4% chose this)
The total capacitance of two or more capacitors in series is
-
always less than that of the smallest capacitor (43% chose this)
-
always greater than that of the largest capacitor (29% chose this)
-
found by adding each of the capacitances together (18% chose this)
-
found by adding the capacitances together and dividing by their total number (11% chose this)
The position of the E layer in the ionosphere is
-
above the F layer (13% chose this)
-
below the F layer (50% chose this)
-
below the D layer (21% chose this)
-
sporadic (17% chose this)
If 200 volt is applied to a 2000 ohm resistor, the resistor will dissipate
-
20 watt (60% chose this)
-
30 watt (0% chose this)
-
10 watt (35% chose this)
-
40 watt (5% chose this)
To replace a written copy of your General Amateur Operator Certificate of Competency you should
-
Apply to an Approved Radio Examiner to re-sit the examination (4% chose this)
-
Download an application form from the Department of Internal Affairs website (4% chose this)
-
Download an application form from the Ministry's website (or have an Approved Radio Examiner do this for you) (39% chose this)
-
Download and print one from the official database (or have an Approved Radio Examiner do this for you) (52% chose this)
In the block diagram of the receiver shown, the output frequency of the "oscillator" is
-
the same as that of the incoming received signal (15% chose this)
-
the same as that of the IF frequency (38% chose this)
-
different from both the incoming signal and IF frequencies (46% chose this)
-
at a low audio frequency (0% chose this)
The voltage drop across a germanium signal diode when conducting is about
-
0.3V (40% chose this)
-
0.6V (13% chose this)
-
0.7V (43% chose this)
-
1.3V (3% chose this)
The published bandplans for the New Zealand amateur bands
-
are determined by the Ministry of Business, Innovation and Employment (61% chose this)
-
change at each equinox (0% chose this)
-
limit the operating frequencies of high-power stations (0% chose this)
-
were developed by NZART in the interests of all radio amateurs (39% chose this)
Radio wave polarisation is defined by the orientation of the radiated
-
magnetic field (42% chose this)
-
electric field (50% chose this)
-
inductive field (4% chose this)
-
capacitive field (4% chose this)
The purpose of a series pass transistor in a regulated power supply is to
-
suppress voltage spikes across the transformer secondary winding (33% chose this)
-
work as a surge multiplier to speed up regulation (11% chose this)
-
amplify output voltage errors to assist regulation (11% chose this)
-
allow for a higher current to be supplied than the regulator would otherwise allow (44% chose this)
To bias a transistor to cut-off, the base must be
-
at the collector potential (27% chose this)
-
at the emitter potential (43% chose this)
-
mid-way between collector and emitter potentials (27% chose this)
-
mid-way between the collector and the supply potentials (3% chose this)
A half wave dipole antenna is normally fed at the point of
-
maximum voltage (11% chose this)
-
maximum current (35% chose this)
-
maximum resistance (5% chose this)
-
resonance (49% chose this)
The driver stage of a transmitter is located
-
before the power amplifier (50% chose this)
-
between oscillator and buffer (19% chose this)
-
with the frequency multiplier (12% chose this)
-
after the output low-pass filter circuit (19% chose this)
The question "Who is calling me?" is asked by
-
QRT? (18% chose this)
-
QRM? (14% chose this)
-
QRP? (9% chose this)
-
QRZ? (59% chose this)
An amplifier has a gain of 40 dB. The ratio of the rms output voltage to the rms input voltage is
-
20 (4% chose this)
-
40 (4% chose this)
-
100 (57% chose this)
-
400 (35% chose this)
On VHF and UHF bands, polarisation of the receiving antenna is important in relation to the transmitting antenna, but on HF it is relatively unimportant because
-
the ionosphere can change the polarisation of the signal from moment to moment (72% chose this)
-
the ground wave and the sky wave continually shift the polarisation (17% chose this)
-
anomalies in the earth's magnetic field profoundly affect HF polarisation (11% chose this)
-
improved selectivity in HF receivers makes changes in polarisation redundant (0% chose this)
An RF amplifier ahead of the mixer stage in a superhet receiver
-
enables the receiver to tune a greater frequency range (16% chose this)
-
means no BFO stage is needed (16% chose this)
-
makes it possible to receive SSB signals (0% chose this)
-
increases the sensitivity of the receiver (68% chose this)
In the figure shown, 3 represents the
-
drain of a junction FET (4% chose this)
-
collector of an npn transistor (50% chose this)
-
emitter of a pnp transistor (31% chose this)
-
base of an npn transistor (15% chose this)
A residual current device is recommended for protection in a mains power circuit because it
-
reduces electrical interference from the circuit (7% chose this)
-
removes power to the circuit when the phase and neutral currents are not equal (48% chose this)
-
removes power to the circuit when the current in the phase wire equals the current in the earth wire (37% chose this)
-
limits the power provided to the circuit (7% chose this)
In the transmitter block diagram shown, the "balanced modulator"
-
balances the high and low frequencies in the audio signal (38% chose this)
-
performs double sideband suppressed carrier modulation (54% chose this)
-
acts as a tone control (0% chose this)
-
balances the standing wave ratio (8% chose this)
The connections to a semiconductor diode are known as
-
cathode and drain (5% chose this)
-
anode and cathode (65% chose this)
-
gate and source (10% chose this)
-
collector and base (20% chose this)
A good voltmeter should have
-
a very high internal resistance (50% chose this)
-
a resistance equal to that of all other components in the circuit (12% chose this)
-
a very low internal resistance (38% chose this)
-
an inductive reactance (0% chose this)
For long distance propagation, the radiation angle of energy from the antenna should be
-
less than 30 degrees (54% chose this)
-
more than 30 degrees but less than forty-five (29% chose this)
-
more than 45 degrees but less than ninety (13% chose this)
-
90 degrees (4% chose this)
In the receiver shown, when receiving a signal, the output frequency of the "oscillator" is
-
the same as that of the signal (0% chose this)
-
the same as that of the IF amplifier (17% chose this)
-
of constant amplitude and frequency (72% chose this)
-
passed through the following filter (11% chose this)
A 7 MHz signal and a 16 MHz oscillator are applied to a mixer stage. The output will contain the input frequencies and
-
8 and 9 MHz (0% chose this)
-
7 and 9 MHz (29% chose this)
-
9 and 23 MHz (54% chose this)
-
3.5 and 9 MHz (17% chose this)
An applicant for a New Zealand General Amateur Operator Certificate of Competency must first qualify by meeting the appropriate examination requirements. Application may then be made by
-
anyone except a representative of a foreign government (15% chose this)
-
only a citizen or permanent resident of New Zealand (50% chose this)
-
anyone except an employee of the Ministry of Business, Innovation, and Employment (4% chose this)
-
anyone (31% chose this)
The audio output transformer in a receiver is required to
-
step up the audio gain (32% chose this)
-
protect the loudspeaker from high currents (9% chose this)
-
improve the audio tone (0% chose this)
-
match the output impedance of the audio amplifier to the speaker (59% chose this)
In the figure shown, 5 represents the
-
grid of a tetrode (29% chose this)
-
screen grid of a tetrode (46% chose this)
-
heater of a pentode (7% chose this)
-
grid of a triode (18% chose this)
You are adjusting an antenna matching unit using an SWR bridge. You should adjust for
-
maximum reflected power (19% chose this)
-
equal reflected and transmitted power (29% chose this)
-
minimum reflected power (42% chose this)
-
minimum transmitted power (10% chose this)
A groundplane antenna emits a
-
horizontally polarised wave (29% chose this)
-
elliptically polarised wave (13% chose this)
-
axially polarised wave (4% chose this)
-
vertically polarised wave (54% chose this)
A low pass filter will
-
suppress sub-harmonics (33% chose this)
-
reduce harmonics (54% chose this)
-
always eliminate interference (8% chose this)
-
improve harmonic radiation (4% chose this)
Two basic types of field effect transistors are
-
n-channel and p-channel (52% chose this)
-
NPN and PNP (44% chose this)
-
germanium and silicon (4% chose this)
-
inductive and capacitive (0% chose this)
The following meter could be used to measure the power supply current drawn by a small hand-held transistorised receiver
-
a power meter (19% chose this)
-
an RF ammeter (10% chose this)
-
a DC ammeter (62% chose this)
-
an electrostatic voltmeter (10% chose this)
The reactance of an inductor increases as the
-
frequency increases (50% chose this)
-
frequency decreases (35% chose this)
-
applied voltage increases (8% chose this)
-
applied voltage decreases (8% chose this)
A 'line of sight' transmission between two stations uses mainly the
-
ionosphere (8% chose this)
-
troposphere (0% chose this)
-
sky wave (33% chose this)
-
ground wave (58% chose this)
To reduce harmonic output from a transmitter, the following could be put in the transmission line as close to the transmitter as possible
-
wave trap (18% chose this)
-
low-pass filter (50% chose this)
-
high-pass filter (11% chose this)
-
band reject filter (21% chose this)
This type of transmission line will exhibit the lowest loss
-
twisted flex (3% chose this)
-
coaxial cable (53% chose this)
-
open-wire feeder (44% chose this)
-
mains cable (0% chose this)
The distance travelled by ground waves in air
-
is the same for all frequencies (0% chose this)
-
is less at higher frequencies (52% chose this)
-
is more at higher frequencies (19% chose this)
-
depends on the maximum usable frequency (30% chose this)
APRS is an adaptation of packet radio. APRS stands for
-
Automatic Packet Reporting System (47% chose this)
-
Amateur Position Reporting System (7% chose this)
-
Automatic Packet Relay System (47% chose this)
-
Amateur Position Relay System (0% chose this)
A superhet receiver receives an incoming signal of 3540 kHz and the local oscillator produces a signal of 3995 kHz. The IF amplifier is tuned to
-
455 kHz (64% chose this)
-
3540 kHz (18% chose this)
-
3995 kHz (9% chose this)
-
7435 kHz (9% chose this)
A good ammeter should have
-
a very high internal resistance (13% chose this)
-
a resistance equal to that of all other components in the circuit (4% chose this)
-
a very low internal resistance (61% chose this)
-
an infinite resistance (22% chose this)
The published New Zealand amateur radio bandplans are
-
obligatory for all amateur radio operators to observe (52% chose this)
-
recommended, and all amateur radio operators should follow them (48% chose this)
-
to show where distant stations can be worked (0% chose this)
-
for tests and experimental purposes only (0% chose this)
The main reason why many VHF base and mobile antennas in amateur use are 5/8 of a wavelength long is that
-
it is easy to match the antenna to the transmitter (15% chose this)
-
it is a convenient length on VHF (11% chose this)
-
the angle of radiation is high giving excellent local coverage (22% chose this)
-
most of the energy is radiated at a low angle (52% chose this)
The correct order for callsigns in a callsign exchange at the start and end of a transmission is
-
the other callsign followed by your own callsign (61% chose this)
-
your callsign followed by the other callsign (30% chose this)
-
your own callsign, repeated twice (9% chose this)
-
the other callsign, repeated twice (0% chose this)
A transmitter power amplifier has a gain of 20 dB. The ratio of the output power to the input power is
-
10 (24% chose this)
-
20 (17% chose this)
-
40 (10% chose this)
-
100 (48% chose this)
The phrase "you are fully quieting the repeater" means
-
your signal is too weak for the repeater to reproduce correctly (32% chose this)
-
your signal into the repeater is strong enough to be noise-free on the output frequency (56% chose this)
-
your modulation level is too low (8% chose this)
-
you are speaking too quietly into the microphone. (4% chose this)
In the figure shown, 3 represents the
-
filament of a tetrode (8% chose this)
-
anode of a triode (8% chose this)
-
grid of a tetrode (58% chose this)
-
screen grid of a pentode (25% chose this)
If the characteristic impedance of a feedline does not match the antenna input impedance then
-
standing waves are produced in the feedline (70% chose this)
-
heat is produced at the junction (20% chose this)
-
the SWR drops to 1:1 (5% chose this)
-
the antenna will not radiate any signal (5% chose this)
In a p-type semiconductor, the current carriers are
-
photons (0% chose this)
-
electrons (44% chose this)
-
positive ions (13% chose this)
-
holes (44% chose this)
Two 20 uH inductances are connected in parallel. The total inductance is
-
10 uH (56% chose this)
-
20 uH (12% chose this)
-
40 uH (32% chose this)
-
80 uH (0% chose this)
Although high frequency signals may be received from a distant station by a sky wave at a certain time, it may not be possible to hear them an hour later. This may be due to
-
changes in the ionosphere (75% chose this)
-
shading of the earth by clouds (0% chose this)
-
changes in atmospheric temperature (10% chose this)
-
absorption of the ground wave signal (15% chose this)
A parasitic oscillation
-
is an unwanted signal developed in a transmitter (71% chose this)
-
is generated by parasitic elements of a Yagi beam (5% chose this)
-
does not cause any radio interference (0% chose this)
-
is produced in a transmitter oscillator stage (24% chose this)
In the block diagram of the receiver shown, the "RF amplifier"
-
decreases random fluctuation noise (9% chose this)
-
masks strong noise (0% chose this)
-
should produce little internal noise (65% chose this)
-
changes the signal frequency (26% chose this)
The following signal can be amplified using a non-linear amplifier
-
SSB (22% chose this)
-
FM (56% chose this)
-
AM (4% chose this)
-
DSBSC (19% chose this)
The "Q" signal which means "send faster" is
-
QRP (7% chose this)
-
QRQ (56% chose this)
-
QRS (26% chose this)
-
QRN (11% chose this)
An earth wire should be connected to the metal chassis of a mains-operated power supply to ensure that if a fault develops, the chassis
-
does not develop a high voltage with respect to earth (63% chose this)
-
does not develop a high voltage with respect to the phase lead (25% chose this)
-
becomes a conductor to bleed away static charge (8% chose this)
-
provides a path to ground in case of lightning strikes (4% chose this)
An antenna which transmits equally well in all compass directions is a
-
dipole with a reflector only (8% chose this)
-
quarterwave grounded vertical (60% chose this)
-
dipole with director only (0% chose this)
-
half-wave horizontal dipole (32% chose this)
Reception of high frequency radio waves beyond 4000 km normally occurs by the
-
ground wave (11% chose this)
-
skip wave (5% chose this)
-
surface wave (5% chose this)
-
sky wave (79% chose this)
When measuring the current drawn by a light bulb from a DC supply, the meter will act in circuit as
-
an insulator (4% chose this)
-
a low value resistance (60% chose this)
-
a perfect conductor (32% chose this)
-
an extra current drain (4% chose this)
The voltage gain of an operational amplifier at low frequencies is
-
very high but purposely reduced using circuit components (54% chose this)
-
very low but purposely increased using circuit components (36% chose this)
-
less than one (7% chose this)
-
undefined (4% chose this)
The "Q" signal "what is your location?" is
-
QTH? (68% chose this)
-
QTC? (0% chose this)
-
QRL? (27% chose this)
-
QRZ? (5% chose this)
The "Q" signal "your signals are fading" is
-
QSO (5% chose this)
-
QSB (71% chose this)
-
QSL (24% chose this)
-
QRX (0% chose this)
Amateur radio repeater equipment and frequencies in New Zealand are co-ordinated by
-
the Ministry of Business, Innovation, and Employment (38% chose this)
-
NZART branches in the main cities (6% chose this)
-
repeater trustees (9% chose this)
-
the NZART Frequency Management and Technical Advisory Group. (47% chose this)
An instrument to check whether RF power in the transmission line is transferred to the antenna is
-
a standing wave ratio meter (79% chose this)
-
an antenna tuner (11% chose this)
-
a dummy load (5% chose this)
-
a keying monitor (5% chose this)
A "high Q" resonant circuit is one which
-
carries a high quiescent current (10% chose this)
-
is highly selective (50% chose this)
-
has a wide bandwidth (7% chose this)
-
uses a high value inductance (33% chose this)
A low-level signal is applied to a transistor circuit input and a higher-level signal is present at the output. This effect is known as
-
amplification (94% chose this)
-
detection (0% chose this)
-
modulation (0% chose this)
-
rectification (6% chose this)
The AGC circuit in a receiver usually controls the
-
audio stage (44% chose this)
-
mixer stage (0% chose this)
-
power supply (0% chose this)
-
RF and IF stages (56% chose this)
VHF and UHF bands are frequently used for satellite communication because
-
waves at these frequencies travel to and from the satellite relatively unaffected by the ionosphere (75% chose this)
-
the Doppler frequency change caused by satellite motion is much less than at HF (20% chose this)
-
satellites move too fast for HF waves to follow (0% chose this)
-
the Doppler effect would cause HF waves to be shifted into the VHF and UHF bands. (5% chose this)
In an n-type semiconductor, the current carriers are
-
holes (45% chose this)
-
electrons (48% chose this)
-
positive ions (6% chose this)
-
photons (0% chose this)
A superhet receiver, with a 500 kHz IF, is receiving a signal at 21.0 MHz. A strong unwanted signal at 22 MHz is interfering. The cause is
-
insufficient IF selectivity (45% chose this)
-
the 22 MHz signal is out-of-band (6% chose this)
-
22 MHz is the image frequency (48% chose this)
-
insufficient RF gain (0% chose this)
The physical length of the antenna shown in this diagram can be shortened and the electrical length maintained, if one of the following items is added at the points shown at 'X' in each wire
-
an inductor (65% chose this)
-
a capacitor (13% chose this)
-
an insulator (9% chose this)
-
a resistor (13% chose this)
On an amateur receiver, unwanted signals are found at every 15.625 kHz. This is probably due to
-
a low-frequency government station (0% chose this)
-
a remote radar station (10% chose this)
-
radiation from a nearby TV line oscillator (50% chose this)
-
none of these (40% chose this)
The difference between DC input power and RF power output of a transmitter RF amplifier
-
radiates from the antenna (26% chose this)
-
is dissipated as heat (56% chose this)
-
is lost in the feedline (7% chose this)
-
is due to oscillating current (11% chose this)
Filter capacitors in power supplies are sometimes connected in series to
-
withstand a greater voltage than a single capacitor can withstand (56% chose this)
-
increase the total capacity (7% chose this)
-
reduce the ripple voltage further (22% chose this)
-
resonate the filter circuit (15% chose this)
A semiconductor is said to be doped when small quantities of the following are added
-
electrons (28% chose this)
-
protons (8% chose this)
-
ions (4% chose this)
-
impurities (60% chose this)
Three 10,000 ohm resistors are connected in series across a 90 volt supply. The voltage drop across one of the resistors is
-
30 volt (65% chose this)
-
60 volt (4% chose this)
-
90 volt (22% chose this)
-
15.8 volt (9% chose this)
The radio wave from the transmitter to the ionosphere and back to earth is correctly known as the
-
sky wave (58% chose this)
-
skip wave (38% chose this)
-
surface wave (0% chose this)
-
F layer (4% chose this)
The distance from the transmitter to the nearest point where the sky wave returns to the earth is called the
-
angle of radiation (10% chose this)
-
maximum usable frequency (7% chose this)
-
skip distance (50% chose this)
-
skip zone (33% chose this)
An amateur radio operator must have current New Zealand postal and email addresses so the Ministry of Business, Innovation, and Employment
-
has a record of the location of each amateur station (41% chose this)
-
can refund overpaid fees (0% chose this)
-
can publish a callsign directory (4% chose this)
-
can send mail to the operator (56% chose this)
The time for one cycle of a 100 Hz signal is
-
1 second (36% chose this)
-
0.01 second (57% chose this)
-
0.0001 second (0% chose this)
-
10 seconds (7% chose this)
In the block diagram shown, the "dummy load" is
-
used to allow adjustment of the transmitter without causing interference to others (89% chose this)
-
a load used to absorb surplus power which is rejected by the antenna system (11% chose this)
-
used to absorb high-voltage impulses caused by lightning strikes to the antenna (0% chose this)
-
an additional load used to compensate for a badly-tuned antenna system (0% chose this)
If a 4800 ohm resistor is connected to a 12 volt battery, the current flow is
-
2.5 mA (64% chose this)
-
25 mA (24% chose this)
-
40 A (4% chose this)
-
400 A (8% chose this)
A new amateur radio operator is permitted to
-
operate on all amateur bands other than VHF at least weekly using a computer for log-keeping (0% chose this)
-
operate only on specified amateur bands for 3 months logging at least 50 contacts and retaining the log book for at least one year for possible official inspection (57% chose this)
-
operate only on one fixed frequency in the amateur bands between 5 and 25 MHz for 6 months and then present the log book for official inspection (21% chose this)
-
operate on amateur bands between 5 and 25 MHz as and when the operator chooses (21% chose this)
A transformer with 100 turns on the primary winding and 10 turns on the secondary winding is connected to 230 volt AC mains. The voltage across the secondary is
-
10 volt (19% chose this)
-
23 volt (76% chose this)
-
110 volt (0% chose this)
-
2300 volt (5% chose this)
Magnetic and electric fields about an antenna are
-
parallel to each other (4% chose this)
-
determined by the type of antenna used (31% chose this)
-
perpendicular to each other (62% chose this)
-
variable with the time of day (4% chose this)
Changes in received signal strength when sky wave propagation is used are called
-
ground wave losses (0% chose this)
-
modulation losses (11% chose this)
-
fading (89% chose this)
-
sunspots (0% chose this)
Two resistors are connected in parallel and are connected across a 40 volt battery. If each resistor is 1000 ohms, the total battery current is
-
40 ampere (10% chose this)
-
40 milliampere (32% chose this)
-
80 ampere (6% chose this)
-
80 milliampere (52% chose this)
The layer of the ionosphere mainly responsible for long distance communication is
-
C (4% chose this)
-
D (12% chose this)
-
E (20% chose this)
-
F (64% chose this)
In the transmitter block diagram shown, the "oscillator" is
-
an audio frequency oscillator (27% chose this)
-
a variable frequency RF oscillator (48% chose this)
-
a beat frequency oscillator (15% chose this)
-
a variable frequency audio oscillator (9% chose this)
An ohmmeter measures the
-
value of any resistance placed between its terminals (62% chose this)
-
impedance of any component placed between its terminals (19% chose this)
-
power factor of any inductor or capacitor placed between its terminals (4% chose this)
-
voltage across any resistance placed between its terminals (15% chose this)
Parasitic oscillations tend to occur in
-
high voltage rectifiers (27% chose this)
-
high gain amplifier stages (62% chose this)
-
antenna matching circuits (8% chose this)
-
SWR bridges (4% chose this)
In the transmitter block diagram shown, the "oscillator"
-
is variable in frequency (35% chose this)
-
generates an audio frequency tone during tests (0% chose this)
-
uses a crystal for good frequency stability (62% chose this)
-
may have a calibrated dial (4% chose this)
To minimise the radiation of one particular harmonic, one can use a
-
wave trap in the transmitter output (48% chose this)
-
resistor (0% chose this)
-
high pass filter in the transmitter output (45% chose this)
-
filter in the receiver lead (6% chose this)
Harmonics may be produced in the RF power amplifier of a transmitter if
-
the modulation level is too low (0% chose this)
-
the modulation level is too high (59% chose this)
-
the oscillator frequency is unstable (41% chose this)
-
modulation is applied to more than one stage (0% chose this)
"RIT" stands for
-
receiver interference transmuter (8% chose this)
-
range independent transmission (13% chose this)
-
receiver incremental tuning (67% chose this)
-
random interference tester (13% chose this)
New Zealand's views on international radio regulatory matters are coordinated by the
-
New Zealand Association of Radio Transmitters (NZART) (39% chose this)
-
Ministry of Business, Innovation, and Employment (48% chose this)
-
International Amateur Radio Union (IARU) (12% chose this)
-
Prime Minister's Office (0% chose this)
If a 12 volt battery supplies 0.15 ampere to a circuit, the circuit's resistance is
-
0.15 ohm (5% chose this)
-
1.8 ohm (23% chose this)
-
12 ohm (0% chose this)
-
80 ohm (73% chose this)
The frequency limits of the �10 metre band� are
-
28.00 to 28.35 MHz (13% chose this)
-
28.00 to 28.40 MHz (13% chose this)
-
28.00 to 29.00 MHz (20% chose this)
-
28.00 to 29.70 MHz (53% chose this)
A variation in received signal strength caused by slowly changing differences in path lengths is called
-
absorption (4% chose this)
-
fading (70% chose this)
-
fluctuation (13% chose this)
-
path loss (13% chose this)
If the carrier insertion oscillator is counted, then a single conversion superhet receiver has
-
one oscillator (16% chose this)
-
two oscillators (64% chose this)
-
three oscillators (8% chose this)
-
four oscillators (12% chose this)
Of two receivers, the one capable of receiving the weakest signal will have
-
an RF gain control (42% chose this)
-
the least internally-generated noise (52% chose this)
-
the loudest audio output (3% chose this)
-
the greatest tuning range (3% chose this)
Narrow-band interference can be caused by
-
transmitter harmonics (53% chose this)
-
a neon sign (30% chose this)
-
a shaver motor (10% chose this)
-
lightning flashes (7% chose this)
The skip distance of a sky wave will be greatest when the
-
ionosphere is most densely ionised (48% chose this)
-
signal given out is strongest (0% chose this)
-
angle of radiation is smallest (52% chose this)
-
polarisation is vertical (0% chose this)
The mixer stage of a superhet receiver
-
produces spurious signals (4% chose this)
-
produces an intermediate frequency signal (74% chose this)
-
acts as a buffer stage (4% chose this)
-
demodulates SSB signals (17% chose this)
Two metal plates separated by air form a 0.001 uF capacitor. Its value may be changed to 0.002 uF by
-
bringing the metal plates closer together (59% chose this)
-
making the plates smaller in size (3% chose this)
-
moving the plates apart (38% chose this)
-
touching the two plates together (0% chose this)
Losses occurring on a transmission line between a transmitter and antenna result in
-
less RF power being radiated (89% chose this)
-
a SWR of 1:1 (0% chose this)
-
reflections occurring in the line (11% chose this)
-
improved transfer of RF energy to the antenna (0% chose this)
The "Q signal" requesting the other station to send slower is
-
QRL (14% chose this)
-
QRN (5% chose this)
-
QRM (5% chose this)
-
QRS (77% chose this)
General Amateur Operator Certificates of Competency and callsigns are issued pursuant to the Regulations by the
-
New Zealand Association of Radio Transmitters (NZART) (38% chose this)
-
Ministry of Business, Innovation, and Employment Approved Radio Examiners (53% chose this)
-
Department of Internal Affairs (6% chose this)
-
Prime Minister's Office (3% chose this)
The following are three digital communication modes
-
DSBSC, PACTOR, NBFM (4% chose this)
-
AGC, FSK, Clover (4% chose this)
-
PSK31, AFC, PSSN (21% chose this)
-
AMTOR, PACTOR, PSK31 (71% chose this)
An inductor and a capacitor form a resonant circuit. The capacitor value is increased by four times. The resonant frequency will
-
increase by four times (13% chose this)
-
double (10% chose this)
-
decrease to half (57% chose this)
-
decrease to one quarter (20% chose this)
Regular changes in the ionosphere occur approximately every 11
-
days (19% chose this)
-
months (0% chose this)
-
years (81% chose this)
-
centuries (0% chose this)
One important application for diodes is recovering information from transmitted signals. This is referred to as
-
biasing (11% chose this)
-
rejuvenation (0% chose this)
-
ionisation (0% chose this)
-
demodulation (89% chose this)
Two resistors are in parallel. Resistor A carries twice the current of resistor B which means that
-
A has half the resistance of B (63% chose this)
-
B has half the resistance of A (22% chose this)
-
the voltage across A is twice that across B (15% chose this)
-
the voltage across B is twice that across A (0% chose this)
The capacitor value best suited for smoothing the output of a 12 volt 1 amp DC power supply is
-
100 pF (21% chose this)
-
10 nF (9% chose this)
-
100 nF (21% chose this)
-
10,000 uF (50% chose this)
A toroidal inductor is one in which the
-
windings are wound on a closed ring of magnetic material (71% chose this)
-
windings are air-spaced (0% chose this)
-
windings are wound on a ferrite rod (25% chose this)
-
inductor is enclosed in a magnetic shield (4% chose this)
A result of standing waves on a non-resonant transmission line is
-
maximum transfer of energy to the antenna from the transmitter (8% chose this)
-
perfect impedance match between transmitter and feedline (12% chose this)
-
reduced transfer of RF energy to the antenna (65% chose this)
-
lack of radiation from the transmission line (15% chose this)
The correct colour coding for the phase wire in a flexible mains lead is
-
brown (71% chose this)
-
blue (13% chose this)
-
yellow and green (4% chose this)
-
white (13% chose this)
Two 33 ohm resistors are connected in series with a power supply. If the current flowing is 100 mA, the voltage across one of the resistors is
-
66 volt (21% chose this)
-
33 volt (11% chose this)
-
3.3 volt (61% chose this)
-
1 volt (7% chose this)
A resistor in a circuit becomes very hot and starts to burn. This is because the resistor is dissipating too much
-
current (42% chose this)
-
voltage (0% chose this)
-
resistance (3% chose this)
-
power (55% chose this)
A 10 mA current is measured in a 500 ohm resistor. The voltage across the resistor will be
-
5 volt (61% chose this)
-
50 volt (21% chose this)
-
500 volt (4% chose this)
-
5000 volt (14% chose this)
A 'skip zone' is
-
the distance between the antenna and where the refracted wave first returns to earth (33% chose this)
-
the distance between the far end of the ground wave and where the refracted wave first returns to earth (57% chose this)
-
the distance between any two refracted waves (10% chose this)
-
a zone caused by lost sky waves (0% chose this)
The smallest resistance that can be made with five 1 k ohm resistors is
-
50 ohm by arranging them in series (10% chose this)
-
50 ohm by arranging them in parallel (21% chose this)
-
200 ohm by arranging them in series (10% chose this)
-
200 ohm by arranging them in parallel (59% chose this)
A 28 MHz radio signal is more likely to be heard over great distances
-
if the transmitter power is reduced (0% chose this)
-
during daylight hours (74% chose this)
-
only during the night (26% chose this)
-
at full moon (0% chose this)
The AGC circuit is to
-
expand the audio gain (14% chose this)
-
limit the extent of amplitude generation (21% chose this)
-
minimise the adjustments needed to the receiver gain control knobs (61% chose this)
-
amplitude limit the crystal oscillator output (4% chose this)
A VSWR meter switched to the "reverse" position provides an indication of
-
power output in watts (3% chose this)
-
relative reflected voltage (59% chose this)
-
relative forward voltage (10% chose this)
-
reflected power in dB (28% chose this)
The process of modulation allows
-
information to be impressed on to a carrier (85% chose this)
-
information to be removed from a carrier (5% chose this)
-
voice and Morse code to be combined (0% chose this)
-
none of these (10% chose this)
In the block diagram of the receiver shown, the "product detector"
-
produces an 800 Hz beat note (13% chose this)
-
separates CW and SSB signals (13% chose this)
-
rejects AM signals (4% chose this)
-
translates signals to audio frequencies (71% chose this)
A low-pass filter used to eliminate the radiation of unwanted signals is connected to the
-
output of the balanced modulator (19% chose this)
-
output of the amateur transmitter (65% chose this)
-
input of the stereo system (0% chose this)
-
input of the mixer stage of your SSB transmitter (15% chose this)
The frequency limits of the �70 centimetre band� are
-
430 to 440 MHz (61% chose this)
-
430 to 450 MHz (25% chose this)
-
435 to 438 MHz (7% chose this)
-
430 to 460 MHz (7% chose this)
The frequency limits of the �2 metre band� are
-
144 to 149 MHz (17% chose this)
-
144 to 148 MHz (74% chose this)
-
146 to 148 MHz (4% chose this)
-
144 to 150 MHz (4% chose this)
In this receiver, an audio frequency gain control would be associated with the block labelled
-
AF amplifier (74% chose this)
-
frequency demodulator (4% chose this)
-
speaker, phones (13% chose this)
-
IF amplifier (9% chose this)
Impedance is a combination of
-
reactance with reluctance (14% chose this)
-
resistance with conductance (28% chose this)
-
resistance with reactance (59% chose this)
-
reactance with radiation (0% chose this)
A General Amateur Operator Certificate of Competency
-
expires after 6 months (0% chose this)
-
contains the unique callsign(s) to be used by that operator (63% chose this)
-
is transferable (0% chose this)
-
permits the transmission of radio waves (37% chose this)
In the figure shown, 2 represents the
-
collector of a pnp transistor (0% chose this)
-
emitter of an npn transistor (22% chose this)
-
base of an npn transistor (74% chose this)
-
source of a junction FET (4% chose this)
In the block diagram shown, the "modem"
-
monitors the demodulated signals (5% chose this)
-
de-emphasises the modulated data (0% chose this)
-
translates digital signals to and from audio signals (89% chose this)
-
determines the modulation protocol (5% chose this)
A sine-wave alternating current of 10 ampere peak has an rms value of
-
5 amp (0% chose this)
-
7.07 amp (89% chose this)
-
14.14 amp (5% chose this)
-
20 amp (5% chose this)
The following combination of 28 ohm resistors has a total resistance of 42 ohm
-
three resistors in series (0% chose this)
-
three resistors in parallel (19% chose this)
-
a combination of two resistors in parallel, then placed in series with another resistor (65% chose this)
-
a combination of two resistors in parallel, then placed in series with another two in parallel (15% chose this)
In the block diagram shown, the additional signal path above the "linear amplifier" block indicates that
-
some power is passed around the linear amplifier for stability (12% chose this)
-
"feed-forward" correction is being used to increase linearity (12% chose this)
-
the linear amplifier input and output terminals may be short-circuited (8% chose this)
-
the linear amplifier may be optionally switched out of circuit to reduce output power (69% chose this)
In New Zealand the frequency limits of the �40 metre band� are
-
7.00 to 7.10 MHz (0% chose this)
-
7.00 to 7.15 MHz (20% chose this)
-
7.00 to 7.30 MHz (72% chose this)
-
7.10 to 7.40 MHz (8% chose this)
In a forward biased pn junction, the electrons
-
flow from p to n (44% chose this)
-
flow from n to p (56% chose this)
-
remain in the n region (0% chose this)
-
remain in the p region (0% chose this)
The voltage 'two volt' is also
-
2000 mV (72% chose this)
-
2000 kV (20% chose this)
-
2000 uV (8% chose this)
-
2000 MV (0% chose this)
A General Amateur Operator Certificate of Competency holder must advise permanent changes to postal and email addresses and update the official database records within
-
One Calendar month (82% chose this)
-
7 days (9% chose this)
-
10 days (5% chose this)
-
one year (5% chose this)
Installing a low-pass filter between the transmitter and transmission line will
-
permit higher frequency signals to pass to the antenna (20% chose this)
-
ensure an SWR not exceeding 2:1 (4% chose this)
-
reduce the power output back to the legal maximum (4% chose this)
-
permit lower frequency signals to pass to the antenna (72% chose this)
A bipolar transistor has three terminals named
-
base, emitter and drain (15% chose this)
-
collector, base and source (4% chose this)
-
emitter, base and collector (69% chose this)
-
drain, source and gate (12% chose this)
The highest frequency that will be reflected back to the earth at any given time is known as the
-
UHF (26% chose this)
-
MUF (67% chose this)
-
OWF (4% chose this)
-
LUF (4% chose this)
Bipolar transistors usually have
-
4 connecting leads (4% chose this)
-
3 connecting leads (69% chose this)
-
2 connecting leads (27% chose this)
-
1 connecting lead (0% chose this)
Which of the following is most likely to cause broad-band continuous interference
-
an electric blanket switch (0% chose this)
-
a refrigerator thermostat (8% chose this)
-
a microwave transmitter (20% chose this)
-
poor commutation in an electric motor (72% chose this)
An antenna type commonly used on HF is the
-
parabolic dish (10% chose this)
-
cubical quad (62% chose this)
-
13-element Yagi (24% chose this)
-
helical Yagi (3% chose this)
In the block diagram of the receiver shown, the "RF amplifier"
-
decreases random fluctuation noise (0% chose this)
-
is a restoring filter amplifier (0% chose this)
-
increases the incoming signal level (82% chose this)
-
changes the signal frequency (18% chose this)
To lower the resonant frequency of an antenna, the operator should
-
lengthen the antenna (62% chose this)
-
centre feed the antenna with TV ribbon (0% chose this)
-
shorten the antenna (34% chose this)
-
ground one end (3% chose this)
A semiconductor is described as a "general purpose audio NPN device". This is a
-
triode (0% chose this)
-
silicon diode (4% chose this)
-
bipolar transistor (75% chose this)
-
field effect transistor (21% chose this)
The "squelch" or "muting" circuitry on a VHF receiver
-
inhibits the audio output unless a station is being received (78% chose this)
-
compresses incoming voice signals to make them more intelligible (0% chose this)
-
reduces audio burst noise due to lightning emissions (4% chose this)
-
reduces the noise on incoming signals (17% chose this)
The resonant frequency of a dipole antenna is mainly determined by
-
its height above the ground (0% chose this)
-
its length (100% chose this)
-
the output power of the transmitter used (0% chose this)
-
the length of the transmission line (0% chose this)
The following is installed in the transmission line as close as possible to a HF transmitter to reduce harmonic output
-
a middle-pass filter (0% chose this)
-
a low-pass filter (78% chose this)
-
a high-pass filter (22% chose this)
-
a band-reject filter (0% chose this)
The 'rms value' of a sine-wave signal is
-
half the peak voltage (5% chose this)
-
1.414 times the peak voltage (9% chose this)
-
the peak-to-peak voltage (5% chose this)
-
0.707 times the peak voltage (82% chose this)
In this diagram the item U corresponds to the
-
boom (72% chose this)
-
reflector (4% chose this)
-
driven element (8% chose this)
-
director (16% chose this)
A component is identified as a capacitor if its value is measured in
-
microvolts (0% chose this)
-
millihenrys (10% chose this)
-
megohms (5% chose this)
-
microfarads (86% chose this)
The accepted way to call "CQ" with a SSB transceiver is
-
"CQ CQ CQ this is ZL1XXX ZL1XXX ZL1XXX" (90% chose this)
-
"This is ZL1XXX calling CQ CQ CQ" (10% chose this)
-
"CQ to anyone, CQ to anyone, I am ZL1XXX" (0% chose this)
-
"CQ CQ CQ CQ CQ this is New Zealand" (0% chose this)
If a 2.2 megohm and a 100 kilohm resistor are connected in series, the total resistance is
-
2.1 megohm (0% chose this)
-
2.11 megohm (3% chose this)
-
2.21 megohm (34% chose this)
-
2.3 megohm (62% chose this)
Two basic types of bipolar transistors are
-
p-channel and n-channel types (21% chose this)
-
NPN and PNP types (75% chose this)
-
diode and triode types (0% chose this)
-
varicap and zener types (4% chose this)
The frequency stability of a receiver is its ability to
-
stay tuned to the desired signal (86% chose this)
-
track the incoming signal as it drifts (5% chose this)
-
provide a frequency standard (10% chose this)
-
provide a digital readout (0% chose this)
A current of 0.5 ampere flows through a resistor when 12 volt is applied. The value of the resistor is
-
6 ohms (40% chose this)
-
12.5 ohms (0% chose this)
-
17 ohms (0% chose this)
-
24 ohms (60% chose this)
In the figure shown, 2 represents the
-
gate of a MOSFET (69% chose this)
-
base of a dual bipolar transistor (19% chose this)
-
anode of a silicon controlled rectifier (8% chose this)
-
cathode of a dual diode (4% chose this)
The basic semiconductor amplifying device is a
-
diode (5% chose this)
-
transistor (86% chose this)
-
pn-junction (5% chose this)
-
silicon gate (5% chose this)
In the transmitter block diagram shown, the "Morse key"
-
turns the DC power to the transmitter on and off (10% chose this)
-
allows the oscillator signal to pass only when the key is depressed (60% chose this)
-
changes the frequency of the transmitted signal when the key is depressed (0% chose this)
-
adds an 800 Hz audio tone to the signal when the key is depressed (30% chose this)
A rare DX station calling CQ on CW and repeating "up 2" at the end of the call means the station
-
will be listening for replies 2 kHz higher in frequency (73% chose this)
-
will reply only to stations sending at greater than 20 wpm (4% chose this)
-
is about to shift his calling frequency 2 kHz higher (19% chose this)
-
will wait more than 2 seconds before replying to his call (4% chose this)
If the frequency of a transmitted signal is so high that we no longer receive a reflection from the ionosphere, the signal frequency is above the
-
speed of light (0% chose this)
-
sun spot frequency (0% chose this)
-
skip distance (24% chose this)
-
maximum usable frequency (76% chose this)
Parasitic oscillations in a RF power amplifier can be suppressed by
-
pulsing the supply voltage (4% chose this)
-
placing suitable chokes, ferrite beads or resistors within the amplifier (79% chose this)
-
screening all input leads (17% chose this)
-
using split-stator tuning capacitors (0% chose this)
The frequency limits of the �80 metre band� are
-
3.50 to 4.0 MHz (11% chose this)
-
3.50 to 3.90 MHz (53% chose this)
-
3.50 to 3.85 MHz (28% chose this)
-
3.6 to 3.9 MHz (8% chose this)
That portion of HF radiation which is directly affected by the surface of the earth is called
-
ionospheric wave (29% chose this)
-
local field wave (4% chose this)
-
ground wave (68% chose this)
-
inverted wave (0% chose this)
The purpose of a VOX unit in a transceiver is to
-
change from receiving to transmitting using the sound of the operator's voice (86% chose this)
-
check the transmitting frequency using the voice operated crystal (0% chose this)
-
enable a volume operated extension speaker for remote listening (9% chose this)
-
enable the variable oscillator crystal (5% chose this)
In the transmitter block diagram shown, the "power amplifier"
-
increases the voltage of the mains to drive the antenna (8% chose this)
-
amplifies the audio frequency component of the signal (13% chose this)
-
amplifies the selected sideband to a suitable level (0% chose this)
-
amplifies the RF signal to a suitable level (79% chose this)
The amateur service is authorised to share a portion of which of the following bands that are heavily used by non-amateur devices
-
2400 to 2500 MHz (66% chose this)
-
1240 to 1300 MHz (3% chose this)
-
144 to 148 MHz (17% chose this)
-
28 to 29.7 MHz (14% chose this)
In the transmitter block diagram shown, the "modulator"
-
is an amplitude modulator with feedback (14% chose this)
-
is an SSB modulator with feedback (4% chose this)
-
causes the speech waveform to gate the oscillator on and off (14% chose this)
-
causes the speech waveform to shift the frequency of the oscillator (68% chose this)
The third harmonic of 7 MHz is
-
10 MHz (0% chose this)
-
14 MHz (8% chose this)
-
21 MHz (79% chose this)
-
28 MHz (13% chose this)
Amateur stations are often regarded as "frequency agile". This means
-
operation is limited to frequency modulation (0% chose this)
-
operators can choose to operate anywhere on a shared band (30% chose this)
-
a bandswitch is required on all transceivers (0% chose this)
-
on a shared band operators can change frequency to avoid interfering (70% chose this)
The resonant frequency of an antenna may be increased by
-
shortening the radiating element (73% chose this)
-
lengthening the radiating element (27% chose this)
-
increasing the height of the radiating element (0% chose this)
-
lowering the radiating element (0% chose this)
The figure shown represents a
-
dual bipolar transistor (13% chose this)
-
dual diode (4% chose this)
-
dual varactor diode (0% chose this)
-
dual gate MOSFET (83% chose this)
To reduce energy from an HF transmitter getting into a television receiver, the following could be placed in the TV antenna lead as close to the TV as possible
-
active filter (0% chose this)
-
low-pass filter (12% chose this)
-
high-pass filter (73% chose this)
-
band reject filter (15% chose this)
The wavelength for a frequency of 25 MHz is
-
15 metres (7% chose this)
-
32 metres (14% chose this)
-
4 metres (14% chose this)
-
12 metres (66% chose this)
In the block diagram shown, the "antenna tuner"
-
adjusts the resonant frequency of the antenna to minimize harmonic radiation (6% chose this)
-
adjusts the resonant frequency of the antenna to maximise power output (38% chose this)
-
changes the standing-wave-ratio on the transmission line to the antenna (0% chose this)
-
adjusts the impedance of the antenna system seen at the transceiver output (56% chose this)
Scattered patches of high ionisation developed seasonally at the height of one of the layers is called
-
sporadic-E (76% chose this)
-
patchy (4% chose this)
-
random reflectors (0% chose this)
-
trans-equatorial ionisation (20% chose this)
The total resistance of several resistors connected in series is
-
less than the resistance of any one resistor (9% chose this)
-
greater than the resistance of any one resistor (86% chose this)
-
equal to the highest resistance present (0% chose this)
-
equal to the lowest resistance present (5% chose this)
Excessive harmonic output may be produced in a transmitter by
-
a linear amplifier (5% chose this)
-
a low SWR (0% chose this)
-
resonant circuits (9% chose this)
-
overdriven amplifier stages (86% chose this)
The characteristic impedance of a 20 metre length of transmission line is 52 ohm. If 10 metres is cut off, the impedance will be
-
13 ohm (0% chose this)
-
26 ohm (32% chose this)
-
39 ohm (0% chose this)
-
52 ohm (68% chose this)
A damaged antenna or feedline attached to the output of a transmitter will present an incorrect load resulting in
-
the driver stage not delivering power to the final (14% chose this)
-
the output tuned circuit breaking down (4% chose this)
-
excessive heat being produced in the transmitter output stage (68% chose this)
-
loss of modulation in the transmitted signal (14% chose this)
A halfwave DC power supply operates from the New Zealand AC mains. The ripple frequency will be
-
25 Hz (15% chose this)
-
50 Hz (40% chose this)
-
70 Hz (13% chose this)
-
100 Hz (32% chose this)
The usual effect of ionospheric storms is to
-
increase the maximum usable frequency (28% chose this)
-
cause a fade-out of sky-wave signals (66% chose this)
-
produce extreme weather changes (0% chose this)
-
prevent communications by ground wave (7% chose this)
The antenna in this diagram can be made to operate on several bands if the following item is installed at the points shown at 'X' in each wire
-
a capacitor (4% chose this)
-
an inductor (26% chose this)
-
a fuse (0% chose this)
-
a parallel-tuned trap (70% chose this)
Resistors of 68 ohm, 47 kilohm, 560 ohm and 10 ohm are connected in parallel. The total resistance is
-
less than 10 ohm (79% chose this)
-
between 68 and 560 ohm (8% chose this)
-
between 560 and and 47 kilohm (0% chose this)
-
greater than 47 kilohm (13% chose this)
If two 10 ohm resistors are connected in series with a 10 volt battery, the battery load is
-
5 watt (61% chose this)
-
10 watt (10% chose this)
-
20 watt (16% chose this)
-
100 watt (13% chose this)
The following feeder is the best match to the base of a quarter wave ground plane antenna
-
300 ohm balanced feedline (8% chose this)
-
50 ohm coaxial cable (79% chose this)
-
75 ohm balanced feedline (8% chose this)
-
300 ohm coaxial cable (4% chose this)
In the block diagram of the receiver shown, the "mixer"
-
combines signals at two different frequencies to produce one at an intermediate frequency (79% chose this)
-
combines sidebands to produce a stronger signal (4% chose this)
-
discriminates against SSB and AM signals (8% chose this)
-
inserts a carrier wave to produce a true FM signal (8% chose this)
For your safety, before checking a fault in a mains operated power supply unit, first
-
short the leads of the filter capacitor (0% chose this)
-
turn off the power and remove the power plug (100% chose this)
-
check the action of the capacitor bleeder resistance (0% chose this)
-
remove and check the fuse in the power supply (0% chose this)
A half-wave antenna resonant at 7100 kHz is approximately this long
-
20 metres (61% chose this)
-
40 metres (23% chose this)
-
80 metres (10% chose this)
-
160 metres (6% chose this)
A receiver with high selectivity has a
-
wide bandwidth (7% chose this)
-
wide tuning range (4% chose this)
-
narrow bandwidth (68% chose this)
-
narrow tuning range (21% chose this)
A transmitting antenna for 28 MHz for mounting on the roof of a car could be a
-
vertical long wire (9% chose this)
-
quarter wave vertical (83% chose this)
-
horizontal dipole (4% chose this)
-
full wave centre fed horizontal (4% chose this)
If the height of the reflecting layer of the ionosphere increases, the skip distance of a high frequency transmission
-
stays the same (4% chose this)
-
decreases (12% chose this)
-
varies regularly (8% chose this)
-
becomes greater (76% chose this)
You can operate this number of identical lamps, each drawing a current of 250 mA, from a 5A supply
-
50 (26% chose this)
-
30 (0% chose this)
-
20 (70% chose this)
-
5 (4% chose this)
The following communication mode is generally used for connecting to a VHF packet radio bulletin board
-
SSB (17% chose this)
-
AM (0% chose this)
-
FM (66% chose this)
-
DSB (17% chose this)
The "Q" signal "are you busy?" is
-
QRM? (14% chose this)
-
QRL? (66% chose this)
-
QRT? (14% chose this)
-
QRZ? (7% chose this)
The fifth harmonic of 7 MHz is
-
12 MHz (8% chose this)
-
19 MHz (13% chose this)
-
28 MHz (0% chose this)
-
35 MHz (79% chose this)
The following resistor combination can most nearly replace a single 150 ohm resistor
-
four 47 ohm resistors in parallel (11% chose this)
-
five 33 ohm resistors in parallel (4% chose this)
-
three 47 ohm resistors in series (68% chose this)
-
five 33 ohm resistors in series (18% chose this)
In digital communications, BPSK stands for
-
binary phase shift keying (76% chose this)
-
baseband polarity shift keying (8% chose this)
-
band pass selective keying (8% chose this)
-
burst pulse signal keying (8% chose this)
A 6 ohm resistor is connected in parallel with a 30 ohm resistor. The total resistance of the combination is
-
5 ohm (83% chose this)
-
8 ohm (9% chose this)
-
24 ohm (9% chose this)
-
35 ohm (0% chose this)
The effect of adding a series inductance to an antenna is to
-
increase the resonant frequency (32% chose this)
-
have no change on the resonant frequency (3% chose this)
-
have little effect (0% chose this)
-
decrease the resonant frequency (65% chose this)
The accepted way to announce that you are listening to a VHF repeater is
-
"hello 6695, this is ZL2ZZZ listening" (12% chose this)
-
"calling 6695, 6695, 6695 from ZL2ZZZ" (0% chose this)
-
"6695 from ZL2ZZZ" (8% chose this)
-
"ZL2ZZZ listening on 6695" (80% chose this)
In a regulated power supply, 'current limiting' is sometimes used to
-
prevent transformer core saturation (18% chose this)
-
protect the mains fuse (18% chose this)
-
minimise short-circuit current passing through the regulator (61% chose this)
-
eliminate earth-leakage effects (3% chose this)
Electrolytic capacitors are used in power supplies because
-
they are tuned to operate at 50 Hz (9% chose this)
-
they have very low losses compared to other types (29% chose this)
-
they radiate less RF noise than other types (6% chose this)
-
they can be obtained in larger values than other types (57% chose this)
A neighbour's stereo system is suffering RF break-through. One possible cure is to
-
put a ferrite bead on the transmitter output lead (34% chose this)
-
put a capacitor across the transmitter output (0% chose this)
-
use open-wire feeders to the antenna (3% chose this)
-
use screened wire for the loudspeaker leads (63% chose this)
The fundamental regulations controlling the Amateur Service are to be found in
-
the International Radio Regulations from the ITU (71% chose this)
-
the Radio Amateur's Handbook (18% chose this)
-
the NZART Callbook (11% chose this)
-
on the packet radio bulletin-board (0% chose this)
In the block diagram of the receiver shown, the "BFO" stands for
-
bad frequency obscurer (0% chose this)
-
basic frequency oscillator (0% chose this)
-
beat frequency oscillator (87% chose this)
-
band filter oscillator (13% chose this)
The 'critical frequency' is defined as the
-
highest frequency to which your transmitter can be tuned (3% chose this)
-
lowest frequency which is reflected back to earth at vertical incidence (27% chose this)
-
minimum usable frequency (3% chose this)
-
highest frequency which will be reflected back to earth at vertical incidence (67% chose this)
When conversing via a VHF or UHF repeater you should pause between overs for about
-
half a second (13% chose this)
-
3 seconds (83% chose this)
-
30 seconds (0% chose this)
-
several minutes (4% chose this)
This commonly available antenna feedline can be buried directly in the ground for some distance without adverse effects
-
75 ohm twinlead (9% chose this)
-
300 ohm twinlead (4% chose this)
-
600 ohm open-wire (0% chose this)
-
coaxial cable (87% chose this)
With a General Amateur Operator Certificate of Competency you may operate transmitters in your station
-
one at a time (3% chose this)
-
one at a time, except for emergency communications (10% chose this)
-
any number at one time (67% chose this)
-
any number, so long as they are transmitting on different bands (20% chose this)
The material separating the plates of a capacitor is the
-
dielectric (83% chose this)
-
semiconductor (8% chose this)
-
resistor (0% chose this)
-
lamination (8% chose this)
The element Silicon is
-
a conductor (0% chose this)
-
an insulator (0% chose this)
-
a superconductor (0% chose this)
-
a semiconductor (100% chose this)
The 80 metre band is useful for working
-
in the summer at midday during high sunspot activity (4% chose this)
-
long distance during daylight hours when absorption is not significant (19% chose this)
-
all points on the earth's surface (4% chose this)
-
up to several thousand kilometres in darkness but atmospheric and man-made noises tend to be high (74% chose this)
Three good electrical conductors are
-
copper, gold, mica (9% chose this)
-
gold, silver, wood (0% chose this)
-
gold, silver, aluminium (87% chose this)
-
copper, aluminium, paper (4% chose this)
For regulatory purposes the world is divided into regions each with different radio spectrum allocations. New Zealand is in
-
Region 1 (5% chose this)
-
Region 2 (5% chose this)
-
Region 3 (54% chose this)
-
Region 4 (35% chose this)
In the block diagram of the receiver shown, the "filter" rejects
-
AM and RTTY signals (8% chose this)
-
unwanted mixer outputs (83% chose this)
-
noise bursts (8% chose this)
-
broadcast band signals (0% chose this)
If a 3 volt battery causes 300 mA to flow in a circuit, the circuit resistance is
-
10 ohm (71% chose this)
-
9 ohm (25% chose this)
-
5 ohm (0% chose this)
-
3 ohm (4% chose this)
When two 500 ohm 1 watt resistors are connected in series, the maximum total power that can be dissipated by both resistors is
-
4 watt (0% chose this)
-
2 watt (77% chose this)
-
1 watt (23% chose this)
-
1/2 watt (0% chose this)
The following formula gives the resistance of a circuit
-
R = I / E [resistance equals current divided by voltage] (17% chose this)
-
R = E x I [resistance equals voltage times current (10% chose this)
-
R = E / R [resistance equals voltage divided by resistance] (7% chose this)
-
R = E / I [resistance equals voltage divided by current] (67% chose this)
Harmonics produced in an early stage of a transmitter may be reduced in a later stage by
-
increasing the signal input to the final stage (14% chose this)
-
using FET power amplifiers (7% chose this)
-
using tuned circuit coupling between stages (69% chose this)
-
using larger value coupling capacitors (10% chose this)
The block marked 'Filter' in the diagram is to
-
filter RF radiation from the output of the power supply (29% chose this)
-
smooth the rectified waveform from the rectifier (65% chose this)
-
act as a 50 Hz tuned circuit (3% chose this)
-
restore voltage variations (3% chose this)
Television interference caused by harmonics radiated from an amateur transmitter could be eliminated by fitting
-
a low-pass filter in the TV receiver antenna input (31% chose this)
-
a high-pass filter in the transmitter output (11% chose this)
-
a low-pass filter in the transmitter output (56% chose this)
-
a band-pass filter to the speech amplifier (3% chose this)
In a regulated power supply, the 'crowbar' is a
-
means to lever up the output voltage (12% chose this)
-
circuit for testing mains fuses (4% chose this)
-
last-ditch protection against failure of the regulator in the supply (77% chose this)
-
convenient means to move such a heavy supply unit (8% chose this)
An electric current passing through a wire will produce around the conductor
-
an electric field (17% chose this)
-
a magnetic field (83% chose this)
-
an electrostatic field (0% chose this)
-
nothing (0% chose this)
The unit of inductance is the
-
farad (4% chose this)
-
henry (87% chose this)
-
ohm (4% chose this)
-
reactance (4% chose this)
An atom that loses an electron becomes
-
a positive ion (55% chose this)
-
an isotope (3% chose this)
-
a negative ion (39% chose this)
-
a radioactive atom (3% chose this)
Your General Amateur Operator Certificate of Competency permits you to
-
work citizen band stations (9% chose this)
-
establish and operate an earth station in the amateur satellite service (91% chose this)
-
service commercial radio equipment over 1 kW output (0% chose this)
-
re-wire fixed household electrical supply mains (0% chose this)
Two amplifiers with gains of 10 dB and 40 dB are connected in cascade. The gain of the combination is
-
8 dB (0% chose this)
-
30 dB (11% chose this)
-
50 dB (75% chose this)
-
400 dB (14% chose this)
In this diagram the item V corresponds to the
-
boom (4% chose this)
-
reflector (88% chose this)
-
driven element (8% chose this)
-
director (0% chose this)
The unit of resistance is the
-
farad (0% chose this)
-
watt (0% chose this)
-
ohm (95% chose this)
-
resistor (5% chose this)
Cross-modulation of a broadcast receiver by a nearby transmitter would be noticed in the receiver as
-
a lack of signals being received (0% chose this)
-
the undesired signal in the background of the desired signal (81% chose this)
-
interference only when a broadcast signal is received (15% chose this)
-
distortion on transmitted voice peaks (4% chose this)
This many 12 volt bulbs can be arranged in series to form a string of lights to operate from a 240 volt power supply
-
12 x 240 (4% chose this)
-
240 + 12 (4% chose this)
-
240 - 12 (0% chose this)
-
240 / 12 (91% chose this)
Two resistors are connected in parallel. R1 is 75 ohm and R2 is 50 ohm. The total resistance of this parallel circuit is
-
10 ohm (4% chose this)
-
70 ohm (0% chose this)
-
30 ohm (75% chose this)
-
40 ohm (21% chose this)
A common use for a magnet is in
-
A computer speaker (88% chose this)
-
An optical mouse (0% chose this)
-
A keyboard (0% chose this)
-
A magnetic loop antenna (13% chose this)
The signal "QRM" means
-
your signals are fading (13% chose this)
-
I am troubled by static (13% chose this)
-
your transmission is being interfered with (68% chose this)
-
is my transmission being interfered with? (6% chose this)
In the block diagram of the receiver shown, the "mixer"
-
changes the signal frequency (88% chose this)
-
rejects SSB and CW signals (0% chose this)
-
protects against receiver overload (0% chose this)
-
limits the noise on the signal (13% chose this)
The purpose of a balun in a transmitting antenna system is to
-
balance harmonic radiation (4% chose this)
-
reduce unbalanced standing waves (12% chose this)
-
protect the antenna system from lightning strikes (4% chose this)
-
match unbalanced and balanced transmission lines (81% chose this)
The following phonetic code is correct for the callsign "ZL1AN"
-
zanzibar london one america norway (0% chose this)
-
zulu lima one alpha november (95% chose this)
-
zulu lima one able nancy (0% chose this)
-
zulu lima one able niner (5% chose this)
A filter used to attenuate a very narrow band of frequencies centred on 3.6 MHz would be called
-
a band-pass filter (14% chose this)
-
a high-pass filter (4% chose this)
-
a low-pass filter (7% chose this)
-
a notch filter (75% chose this)
SSB transmissions
-
occupy about twice the bandwidth of AM transmissions (18% chose this)
-
contain more information than AM transmissions (4% chose this)
-
occupy about half the bandwidth of AM transmissions (75% chose this)
-
are compatible with FM transmissions (4% chose this)
A result of mismatch between the power amplifier of a transmitter and the antenna is
-
reduced antenna radiation (78% chose this)
-
radiation of key clicks (7% chose this)
-
lower modulation percentage (4% chose this)
-
smaller DC current drain (11% chose this)
A dry cell has an open circuit voltage of 1.5 volt. When supplying a large current the voltage drops to 1.2 volt. This is due to the cell's
-
internal resistance (70% chose this)
-
voltage capacity (10% chose this)
-
electrolyte becoming dry (7% chose this)
-
current capacity (13% chose this)
Three 12 ohm resistors are wired in parallel and connected to an 8 volt supply. The total current flow from the supply is
-
1 ampere (6% chose this)
-
2 amperes (68% chose this)
-
3 amperes (19% chose this)
-
4.5 amperes (6% chose this)
The minimum age for a person to hold a General Amateur Operator Certificate of Competency is
-
12 years (4% chose this)
-
16 years (19% chose this)
-
21 years (0% chose this)
-
there is no age limit (78% chose this)
Capacitors and inductors oppose an alternating current. This is known as
-
resistance (10% chose this)
-
resonance (14% chose this)
-
conductance (3% chose this)
-
reactance (72% chose this)
Each stage of a three-stage amplifier provides 5 dB gain. The total amplification is
-
10 dB (7% chose this)
-
15 dB (75% chose this)
-
25 dB (7% chose this)
-
125 dB (11% chose this)
A qualified operator of an amateur radio station may permit anyone to
-
operate the station under direct supervision (37% chose this)
-
send business traffic to any other station. (3% chose this)
-
pass brief comments of a personal nature provided no fees or other considerations are requested or accepted (60% chose this)
-
use the station for Morse sending practice (0% chose this)
The figure in a receiver's specifications which indicates its sensitivity is the
-
bandwidth of the IF in kilohertz (13% chose this)
-
audio output in watts (0% chose this)
-
signal plus noise to noise ratio (88% chose this)
-
number of RF amplifiers (0% chose this)
If two receivers are compared, the more sensitive receiver will produce
-
more than one signal (0% chose this)
-
less signal and more noise (5% chose this)
-
more signal and less noise (95% chose this)
-
a steady oscillator drift (0% chose this)
Skip distance is a term associated with signals through the ionosphere. Skip effects are due to
-
reflection and refraction from the ionosphere (100% chose this)
-
selective fading of local signals (0% chose this)
-
high gain antennas being used (0% chose this)
-
local cloud cover (0% chose this)
This voltage is needed to cause a current of 200 mA to flow in a lamp of 25 ohm resistance
-
5 volt (75% chose this)
-
8 volt (14% chose this)
-
175 volt (4% chose this)
-
225 volt (7% chose this)
In the block diagram shown, the block designated "modem" is a
-
modulator/demodulator (91% chose this)
-
modulation emphasis unit (4% chose this)
-
Morse demodulator (0% chose this)
-
MOSFET de-emphasis unit (4% chose this)
The name for the flow of electrons in an electric circuit is
-
voltage (15% chose this)
-
resistance (0% chose this)
-
capacitance (4% chose this)
-
current (81% chose this)
An amateur radio operator may knowingly interfere with another radio communication or signal
-
when the operator of another station is acting in an illegal manner (0% chose this)
-
when another station begins transmitting on a frequency you already occupy (0% chose this)
-
never (100% chose this)
-
when the interference is unavoidable because of crowded band conditions (0% chose this)
The medium which reflects high frequency radio waves back to the earth's surface is called the
-
biosphere (0% chose this)
-
stratosphere (0% chose this)
-
ionosphere (88% chose this)
-
troposphere (12% chose this)
The total resistance of four 68 ohm resistors wired in parallel is
-
12 ohm (6% chose this)
-
17 ohm (65% chose this)
-
34 ohm (15% chose this)
-
272 ohm (15% chose this)
Each of 9 resistors in a circuit is dissipating 4 watt. If the circuit operates from a 12 volt supply, the total current flowing in the circuit is
-
48 ampere (3% chose this)
-
36 ampere (21% chose this)
-
9 ampere (0% chose this)
-
3 ampere (76% chose this)
In the transmitter block diagram shown, the "master oscillator" produces
-
a steady signal at the required carrier frequency (73% chose this)
-
a pulsating signal at the required carrier frequency (20% chose this)
-
a 800 Hz signal to modulate the carrier (7% chose this)
-
a modulated CW signal (0% chose this)
Operation on the 130 to 190 kHz band requires
-
a vertical half-wave antenna (7% chose this)
-
special permission to operate in daylight hours (7% chose this)
-
power output limited to 5 watt e.i.r.p. maximum (81% chose this)
-
receivers with computers with sound cards (4% chose this)
When two 1000 ohm 5 watt resistors are connected in parallel, they can dissipate a maximum total power of
-
40 watt (3% chose this)
-
20 watt (6% chose this)
-
10 watt (69% chose this)
-
5 watt (22% chose this)
A superhet receiver, with an IF at 500 kHz, is receiving a 14 MHz signal. The local oscillator frequency is
-
14.5 MHz (79% chose this)
-
19 MHz (4% chose this)
-
500 kHz (4% chose this)
-
28 MHz (14% chose this)
The speed of a radio wave
-
varies indirectly to the frequency (4% chose this)
-
is the same as the speed of light (85% chose this)
-
is infinite in space (4% chose this)
-
is always less than half the speed of light (8% chose this)
The three leads from a PNP transistor are named the
-
collector, source, drain (19% chose this)
-
gate, source, drain (13% chose this)
-
drain, base, source (0% chose this)
-
collector, emitter, base (69% chose this)
A transmitter power amplifier requires 30 mA at 300 volt. The DC input power is
-
300 watt (15% chose this)
-
9000 watt (18% chose this)
-
9 watt (65% chose this)
-
6 watt (3% chose this)
The holder of a General Amateur Operator Certificate of Competency may permit anyone to
-
use an amateur radio station to communicate with other radio amateurs (17% chose this)
-
pass brief messages of a personal nature provided no fees or other consideration are requested or accepted (63% chose this)
-
operate the amateur station under the supervision and in the presence of a qualified operator (20% chose this)
-
take part in communications only if prior written permission is received from the Ministry of Business, Innovation, and Employment (0% chose this)
An important factor to consider when high angle radiation is desired from a horizontal half-wave antenna is the
-
size of the antenna wire (8% chose this)
-
time of the year (4% chose this)
-
height of the antenna (85% chose this)
-
mode of propagation (4% chose this)
As temperature increases, the resistance of a metallic conductor
-
increases (67% chose this)
-
decreases (30% chose this)
-
remains constant (3% chose this)
-
becomes negative (0% chose this)
Harmonic frequencies are
-
always lower in frequency than the fundamental frequency (0% chose this)
-
at multiples of the fundamental frequency (88% chose this)
-
any unwanted frequency above the fundamental frequency (8% chose this)
-
any frequency causing TVI (4% chose this)
A transistor can be destroyed in a circuit by
-
excessive light (0% chose this)
-
excessive heat (92% chose this)
-
saturation (4% chose this)
-
cut-off (4% chose this)
A receiver squelch circuit
-
automatically keeps the audio output at maximum level (0% chose this)
-
silences the receiver speaker during periods of no received signal (96% chose this)
-
provides a noisy operating environment (4% chose this)
-
is not suitable for pocket-size receivers (0% chose this)
Several stations advise that your FM simplex transmission in the "two metre" band is distorted. The cause might be that
-
the transmitter modulation deviation is too high (73% chose this)
-
your antenna is too low (3% chose this)
-
the transmitter has become unsynchronised (17% chose this)
-
your transmitter frequency split is incorrect (7% chose this)
A vertical antenna which uses a flat conductive surface at its base is the
-
vertical dipole (24% chose this)
-
quarter wave ground plane (76% chose this)
-
rhombic (0% chose this)
-
long wire (0% chose this)
In this block diagram, the block designated "antenna tuner" is not normally necessary when
-
the antenna input impedance is 50 ohms (81% chose this)
-
a half wave antenna is used, fed at one end (15% chose this)
-
the antenna is very long compared to a wavelength (4% chose this)
-
the antenna is very short compared to a wavelength (0% chose this)
A half-wave antenna is often called a
-
bi-polar (0% chose this)
-
Yagi (0% chose this)
-
dipole (96% chose this)
-
beam (4% chose this)
The correct name for the equivalent of 'one cycle per second' is one
-
henry (0% chose this)
-
volt (0% chose this)
-
hertz (100% chose this)
-
coulomb (0% chose this)
Two 20 uH inductances are connected in series. The total inductance is
-
10 uH (21% chose this)
-
20 uH (0% chose this)
-
40 uH (79% chose this)
-
80 uH (0% chose this)
The "Q" signal "shall I decrease transmitter power?" is
-
QRP? (81% chose this)
-
QRZ? (4% chose this)
-
QRN? (7% chose this)
-
QRL? (7% chose this)
The correct colour coding for the earth wire in a flexible mains lead is
-
brown (0% chose this)
-
blue (0% chose this)
-
yellow and green (100% chose this)
-
white (0% chose this)
A high-pass filter can be used to
-
prevent interference to a telephone (0% chose this)
-
prevent overmodulation in a transmitter (6% chose this)
-
prevent interference to a TV receiver (67% chose this)
-
pass a band of speech frequencies in a modulator (27% chose this)
You hear a station using the callsign �VK3XYZ stroke ZL� on your local VHF repeater. This is
-
a callsign not authorised for use in New Zealand (4% chose this)
-
a confused illegal operator (8% chose this)
-
the station of an overseas visitor (88% chose this)
-
probably an unlicensed person using stolen equipment (0% chose this)
An amplifier with a gain of 20 dB has a -10 dB attenuator connected in cascade. The gain of the combination is
-
8 dB (7% chose this)
-
10 dB (82% chose this)
-
-10 dB (4% chose this)
-
-200 dB (7% chose this)
The prime document for the administration of the Amateur Service in New Zealand is the
-
New Zealand Radiocommunications Regulations (82% chose this)
-
Broadcasting Act (7% chose this)
-
Radio Amateur's Handbook (0% chose this)
-
minutes of the International Telecommunication Union meetings (11% chose this)
A more important consideration when selecting an antenna for working stations at great distances is
-
sunspot activity (4% chose this)
-
angle of radiation (85% chose this)
-
impedance (11% chose this)
-
bandwidth (0% chose this)
In this diagram the item X corresponds to the
-
boom (7% chose this)
-
reflector (4% chose this)
-
director (85% chose this)
-
driven element (4% chose this)
A signal report of "5 and 1" indicates
-
very low intelligibility but good signal strength (15% chose this)
-
perfect intelligibility but very low signal strength (85% chose this)
-
perfect intelligibility, high signal strength (0% chose this)
-
medium intelligibilty and signal strength (0% chose this)
The total resistance in a parallel circuit
-
is always less than the smallest resistance (82% chose this)
-
depends upon the voltage drop across each branch (4% chose this)
-
could be equal to the resistance of one branch (14% chose this)
-
depends upon the applied voltage (0% chose this)
A high-pass filter attenuates
-
a band of frequencies in the VHF region (0% chose this)
-
all except a band of VHF frequencies (0% chose this)
-
high frequencies but not low frequencies (38% chose this)
-
low frequencies but not high frequencies (62% chose this)
A high-pass RF filter would normally be fitted
-
between transmitter output and feedline (31% chose this)
-
at the antenna terminals of a TV receiver (64% chose this)
-
at the Morse key or keying relay in a transmitter (3% chose this)
-
between microphone and speech amplifier (3% chose this)
The letters BBS stand for
-
binary baud system (11% chose this)
-
bulletin board system (82% chose this)
-
basic binary selector (0% chose this)
-
broadcast band stopper (7% chose this)
The ionosphere
-
is a magnetised belt around the earth (0% chose this)
-
consists of magnetised particles around the earth (0% chose this)
-
is formed from layers of ionised gases around the earth (96% chose this)
-
is a spherical belt of solar radiation around the earth (4% chose this)
In the block diagram of the receiver shown, the "AF amplifier"
-
amplifies stereo signals (10% chose this)
-
amplifies speech frequencies (77% chose this)
-
is an all frequency amplifier (13% chose this)
-
must be fitted with a tone control (0% chose this)
The term "amateur third party communications" refers to
-
a simultaneous communication between three operators (0% chose this)
-
the transmission of commercial or secret messages (0% chose this)
-
messages to or on behalf of non-licensed people or organisations (92% chose this)
-
none of the above (8% chose this)
You are mobile and talking through a VHF repeater. The other station reports that you keep "dropping out". This means
-
your signal is drifting lower in frequency (11% chose this)
-
your signal does not have enough strength to operate the repeater (85% chose this)
-
your voice is too low-pitched to be understood (4% chose this)
-
you are not speaking loudly enough (0% chose this)
This combination of series resistors could replace a single 120 ohm resistor
-
five 24 ohm (82% chose this)
-
six 22 ohm (7% chose this)
-
two 62 ohm (11% chose this)
-
five 100 ohm (0% chose this)
A New Zealand General Amateur Operator Certificate of Competency allows you to operate
-
anywhere in the world (12% chose this)
-
anywhere in New Zealand and in any other country that recognises the Certificate (88% chose this)
-
within 50 km of your home station location (0% chose this)
-
only at your home address (0% chose this)
The unit for potential difference between two points in a circuit is the
-
ampere (4% chose this)
-
volt (82% chose this)
-
ohm (7% chose this)
-
coulomb (7% chose this)
The designed output impedance of the antenna socket of most modern transmitters is nominally
-
25 ohm (0% chose this)
-
50 ohm (88% chose this)
-
75 ohm (8% chose this)
-
100 ohm (4% chose this)
Three recognised layers of the ionosphere that affect radio propagation are
-
A, E, F (13% chose this)
-
B, D, E (10% chose this)
-
C, E, F (0% chose this)
-
D, E, F (77% chose this)
Morse code is permitted for use by
-
only operators who have passed a Morse code test (4% chose this)
-
those stations with computers to decode it (0% chose this)
-
any amateur radio operator (96% chose this)
-
only those stations equipped for headphone reception (0% chose this)
A radio wave may follow two or more different paths during propagation and produce slowly-changing phase differences between signals at the receiver resulting in a phenomenon called
-
absorption (3% chose this)
-
baffling (3% chose this)
-
fading (72% chose this)
-
skip (22% chose this)
The abbreviation �HF� refers to the radio spectrum between
-
2 MHz and 10 MHz (4% chose this)
-
3 MHz and 30 MHz (88% chose this)
-
20 MHz and 200 MHz (8% chose this)
-
30 MHz and 300 MHz (0% chose this)
If you transmit from another amateur's station, the person responsible for its proper operation is
-
both of you (12% chose this)
-
the other amateur (the station�s owner) (6% chose this)
-
you, the operator (70% chose this)
-
the station owner, unless the station records show that you were the operator at the time (12% chose this)
The MUF for a given radio path is the
-
mean of the maximum and minimum usable frequencies (0% chose this)
-
maximum usable frequency (88% chose this)
-
minimum usable frequency (12% chose this)
-
mandatory usable frequency (0% chose this)
The 'skywave' is another name for the
-
ionospheric wave (92% chose this)
-
tropospheric wave (8% chose this)
-
ground wave (0% chose this)
-
inverted wave (0% chose this)
One quarter of one ampere may be written as
-
250 microampere (4% chose this)
-
0.5 ampere (0% chose this)
-
0.25 milliampere (14% chose this)
-
250 milliampere (82% chose this)
Which of the following operating arrangements allows a NZ citizen holding a General Amateur Operator�s Certificate of Competency and a call-sign to operate in many European countries
-
CEPT agreement (60% chose this)
-
IARP agreement (3% chose this)
-
ITU reciprocal license (25% chose this)
-
All of these choices are correct (13% chose this)
In an atom
-
the protons and the neutrons orbit the nucleus in opposite directions (0% chose this)
-
the protons orbit around the neutrons (7% chose this)
-
the electrons orbit the nucleus (80% chose this)
-
the electrons and the neutrons orbit the nucleus (13% chose this)
The signal from a CW transmitter consists of
-
a continuous, unmodulated RF waveform (10% chose this)
-
a continuous RF waveform modulated with an 800 Hz Morse signal (3% chose this)
-
an RF waveform which is keyed on and off to form Morse characters (83% chose this)
-
a continuous RF waveform which changes frequency in synchronism with an applied Morse signal (3% chose this)
If an antenna feedline must pass near grounded metal objects, the following type should be used
-
75 ohm twinlead (0% chose this)
-
300 ohm twinlead (4% chose this)
-
600 ohm open-wire (0% chose this)
-
coaxial cable (96% chose this)
In the block diagram of the receiver shown, the "IF amplifier" is an
-
isolation frequency amplifier (10% chose this)
-
intelligence frequency amplifier (0% chose this)
-
indeterminate frequency amplifier (7% chose this)
-
intermediate frequency amplifier (83% chose this)
Five 10 ohm resistors connected in series give a total resistance of
-
1 ohm (0% chose this)
-
5 ohms (0% chose this)
-
10 ohms (4% chose this)
-
50 ohms (96% chose this)
In the block diagram shown, the "SWR bridge" is a
-
switched wave rectifier for monitoring power output (11% chose this)
-
static wave reducer to minimize static electricity from the antenna (4% chose this)
-
device to monitor the standing-wave-ratio on the antenna feedline (86% chose this)
-
short wave rectifier to protect against lightning strikes (0% chose this)
The purpose of the final amplifier in a transmitter is to
-
increase the frequency of a signal (4% chose this)
-
isolate the multiplier and later stages (0% chose this)
-
produce a stable radio frequency (11% chose this)
-
increase the power fed to the antenna (86% chose this)
A General Amateur Operator Certificate of Competency is normally issued for
-
1 year (0% chose this)
-
5 years (3% chose this)
-
10 years (19% chose this)
-
life (77% chose this)
A log-book for recording stations worked
-
is compulsory for every amateur radio operator (20% chose this)
-
is recommended for all amateur radio operators (80% chose this)
-
must list all messages sent (0% chose this)
-
must record time in UTC (0% chose this)
High Frequency long-distance propagation is most dependent on
-
ionospheric reflection (86% chose this)
-
tropospheric reflection (11% chose this)
-
ground reflection (4% chose this)
-
inverted reflection (0% chose this)
The output voltage of a DC power supply decreases when current is drawn from it because
-
drawing output current causes the input mains voltage to decrease (9% chose this)
-
drawing output current causes the input mains frequency to decrease (9% chose this)
-
all power supplies have some internal resistance (73% chose this)
-
some power is reflected back into the mains. (9% chose this)
After qualifying and gaining a General Amateur Operator Certificate of Competency you are permitted to
-
operate on any frequency in the entire radio spectrum (4% chose this)
-
first operate for three months on amateur radio bands below 5 MHz and bands above 25 MHz to log fifty or more contacts (96% chose this)
-
ignore published bandplans (0% chose this)
-
make frequent tune-up transmissions at 10 MHz (0% chose this)
The term "PTT" means
-
push to talk (100% chose this)
-
piezo-electric transducer transmitter (0% chose this)
-
phase testing terminal (0% chose this)
-
phased transmission transponder (0% chose this)
The "S meter" on a receiver
-
indicates where the squelch control should be set (0% chose this)
-
indicates the standing wave ratio (8% chose this)
-
indicates the state of the battery voltage (0% chose this)
-
indicates relative incoming signal strengths (92% chose this)
The callsign of a New Zealand amateur radio station
-
is listed in the administration's database (80% chose this)
-
can be any sequence of characters made-up by the operator (0% chose this)
-
can never be changed (20% chose this)
-
is changed annually (0% chose this)
A current of 2 ampere flows through a 16 ohm resistance. The applied voltage is
-
8 volt (20% chose this)
-
14 volt (0% chose this)
-
18 volt (0% chose this)
-
32 volt (80% chose this)
The path radio waves normally follow from a transmitting antenna to a receiving antenna at VHF and higher frequencies is a
-
circular path going north or south from the transmitter (7% chose this)
-
great circle path (0% chose this)
-
straight line (83% chose this)
-
bent path via the ionosphere (10% chose this)
In the transmitter block diagram shown, the "speech amplifier"
-
amplifies the audio signal from the microphone (92% chose this)
-
is a spectral equalization entropy changer (0% chose this)
-
amplifies only speech, while discriminating against background noises (4% chose this)
-
shifts the frequency spectrum of the audio signal into the RF region (4% chose this)
Three 500 ohm resistors are wired in series. Short-circuiting the centre resistor will change the value of the network from
-
1500 ohm to 1000 ohm (89% chose this)
-
500 ohm to 1000 ohm (0% chose this)
-
1000 ohm to 500 ohm (7% chose this)
-
1000 ohm to 1500 ohm (4% chose this)
The maximum radiation from a three element Yagi antenna is
-
in the direction of the reflector end of the boom (9% chose this)
-
in the direction of the director end of the boom (73% chose this)
-
at right angles to the boom (12% chose this)
-
parallel to the line of the coaxial feeder (6% chose this)
Solar cycles have an average length of
-
1 year (10% chose this)
-
3 years (0% chose this)
-
6 years (7% chose this)
-
11 years (83% chose this)
A band-pass filter will
-
pass frequencies each side of a band (13% chose this)
-
attenuate low frequencies but not high frequencies (3% chose this)
-
attenuate frequencies each side of a band (75% chose this)
-
attenuate high frequencies but not low frequencies (9% chose this)
Many receivers have both RF and AF gain controls. These allow the operator to
-
vary the receiver frequency and AM transmitter frequency independently (4% chose this)
-
vary the low and high frequency audio gain independently (0% chose this)
-
vary the receiver's "real" and "absolute" frequencies independently (0% chose this)
-
vary the gain of the radio frequency and audio frequency amplifier stages independently (96% chose this)
You may operate your amateur radio station somewhere in New Zealand for short periods away from the location entered in the administration's database
-
only during times of emergency (0% chose this)
-
only after giving proper notice to the Ministry of Business, Innovation, and Employment (11% chose this)
-
during an approved emergency practice (0% chose this)
-
whenever you want to (89% chose this)
The correct instrument for measuring the supply current to an amplifier is a
-
wattmeter (7% chose this)
-
voltmeter (7% chose this)
-
ammeter (86% chose this)
-
ohmmeter (0% chose this)
Your responsibility as a station operator is that you must
-
allow another amateur to operate your station upon request (0% chose this)
-
be present whenever the station is operated (14% chose this)
-
be responsible for the proper operation of the station in accordance with the Radiocommunications Regulations (86% chose this)
-
notify the Ministry of Business, Innovation, and Employment if another amateur acts as the operator (0% chose this)
The output power rating of a linear amplifier in a SSB transmitter is specified by the
-
peak DC input power (7% chose this)
-
mean AC input power (0% chose this)
-
peak envelope power (89% chose this)
-
unmodulated carrier power (4% chose this)
A "pileup" is
-
an old, worn-out radio (0% chose this)
-
another name for a junkbox (0% chose this)
-
a large group of stations all calling the same DX station (100% chose this)
-
a type of selenium rectifier (0% chose this)
Unwanted signals from a radio transmitter which cause harmful interference to other users are known as
-
rectified signals (0% chose this)
-
re-radiation signals (0% chose this)
-
reflected signals (4% chose this)
-
harmonic and other spurious signals (96% chose this)
All amateur stations, regardless of the mode of transmission used, must be equipped with
-
a reliable means for determining the operating radio frequency (100% chose this)
-
a dummy antenna (0% chose this)
-
an overmodulation indicating device (0% chose this)
-
a dc power meter (0% chose this)
In the figure shown, 2 represents the
-
base of a pnp transistor (78% chose this)
-
drain of a junction FET (3% chose this)
-
gate of a junction FET (3% chose this)
-
emitter of a pnp transistor (16% chose this)
The frequency band 146 to 148 MHz is
-
shared with other communication services (69% chose this)
-
allocated exclusively for police communications (3% chose this)
-
exclusive to repeater operation (19% chose this)
-
reserved for emergency communications (8% chose this)
The transmission of messages in a secret code by the operator of an amateur station is
-
permitted when communications are transmitted on behalf of a government agency (10% chose this)
-
permitted when communications are transmitted on behalf of third parties (6% chose this)
-
permitted during amateur radio contests (3% chose this)
-
not permitted except for control signals by the licensees of remote beacon or repeater stations (81% chose this)
When an 8 ohm resistor is connected across a 12 volt supply the current flow is
-
12 / 8 amps (86% chose this)
-
8 / 12 amps (7% chose this)
-
12 - 8 amps (7% chose this)
-
12 + 8 amps (0% chose this)
The following unit in a DC power supply performs a rectifying operation
-
an electrolytic capacitor (14% chose this)
-
a fuse (5% chose this)
-
a crowbar (14% chose this)
-
a full-wave diode bridge (68% chose this)
A low-pass filter is used in the antenna lead from a transmitter
-
to reduce key clicks developed in a CW transmitter (4% chose this)
-
to increase harmonic radiation (4% chose this)
-
to eliminate chirp in CW transmissions (0% chose this)
-
to reduce radiation of harmonics (93% chose this)
When a HF transmitted radio signal reaches a receiver, small changes in the ionosphere can cause
-
consistently stronger signals (0% chose this)
-
a change in the ground wave signal (4% chose this)
-
variations in signal strength (93% chose this)
-
consistently weaker signals (4% chose this)
The better conductor of electricity is
-
copper (96% chose this)
-
carbon (0% chose this)
-
silicon (0% chose this)
-
aluminium (4% chose this)
In the block diagram shown, the "antenna switch"
-
switches the transmitter output to the dummy load for tune-up purposes (93% chose this)
-
switches the antenna from transmit to receive (0% chose this)
-
switches the frequency of the antenna for operation on different bands (4% chose this)
-
switches surplus output power from the antenna to the dummy load to avoid distortion. (4% chose this)
The skip distance of radio signals is determined by the
-
type of transmitting antenna used (0% chose this)
-
power fed to the final amplifier of the transmitter (0% chose this)
-
only the angle of radiation from the antenna (4% chose this)
-
both the height of the ionosphere and the angle of radiation from the antenna (96% chose this)
A licence that provides for a given class of radio transmitter to be used without requiring a licence in the owner�s own name is known as
-
a repeater licence (20% chose this)
-
a general user radio licence (71% chose this)
-
a beacon licence (3% chose this)
-
a reciprocal licence (6% chose this)
Signal fadeouts resulting from an 'ionospheric storm' or 'sudden ionospheric disturbance' are usually attributed to
-
heating of the ionised layers (4% chose this)
-
over-use of the signal path (0% chose this)
-
insufficient transmitted power (0% chose this)
-
solar flare activity (96% chose this)
One megahertz is equal to
-
0.0001 Hz (0% chose this)
-
100 kHz (0% chose this)
-
1000 kHz (96% chose this)
-
10 Hz (4% chose this)
The total current in a parallel circuit is equal to the
-
current in any one of the parallel branches (6% chose this)
-
sum of the currents through all the parallel branches (81% chose this)
-
applied voltage divided by the value of one of the resistive elements (6% chose this)
-
source voltage divided by the sum of the resistive elements (6% chose this)
To obtain efficient transfer of power from a transmitter to an antenna, it is important that there is a
-
high load impedance (0% chose this)
-
low load impedance (4% chose this)
-
correct impedance match between transmitter and antenna (93% chose this)
-
high standing wave ratio (4% chose this)
Before calling CQ on the HF bands, you should
-
listen first, then ask if the frequency is in use (100% chose this)
-
request that other operators clear the frequency (0% chose this)
-
request a signal report from any station listening (0% chose this)
-
use a frequency where many stations are already calling (0% chose this)
The voltage to cause a current of 4.4 ampere in a 50 ohm resistance is
-
2220 volt (0% chose this)
-
220 volt (93% chose this)
-
22.0 volt (4% chose this)
-
0.222 volt (4% chose this)
An RF transmission line should be matched at the transmitter end to
-
prevent frequency drift (0% chose this)
-
overcome fading of the transmitted signal (4% chose this)
-
ensure that the radiated signal has the intended polarisation (0% chose this)
-
transfer maximum power to the antenna (96% chose this)
A current of 0.5 ampere flows through a resistance when 6 volt is applied. To change the current to 0.25 ampere the voltage must be
-
increased to 12 volt (7% chose this)
-
reduced to 3 volt (89% chose this)
-
held constant (0% chose this)
-
reduced to zero (4% chose this)
The unit for power is the
-
ohm (0% chose this)
-
watt (93% chose this)
-
ampere (4% chose this)
-
volt (4% chose this)
The term describing opposition to electron flow in a metallic circuit is
-
current (0% chose this)
-
voltage (0% chose this)
-
resistance (100% chose this)
-
power (0% chose this)
In the block diagram shown, the connection between the "antenna tuner" and the "antenna" could be made with
-
three-wire mains power cable (0% chose this)
-
heavy hook-up wire (0% chose this)
-
50 ohm coaxial cable (96% chose this)
-
an iron-cored transformer (4% chose this)
The number of high frequency bands open to long distance communication at any time depends on
-
the highest frequency at which ionospheric reflection can occur (100% chose this)
-
the number of frequencies the receiver can tune (0% chose this)
-
the power being radiated by the transmitting station (0% chose this)
-
the height of the transmitting antenna (0% chose this)
The DC input power of a transmitter operating at 12 volt and drawing 500 milliamp would be
-
6 watt (89% chose this)
-
12 watt (7% chose this)
-
20 watt (4% chose this)
-
500 watt (0% chose this)
The Amateur Service may be briefly defined as
-
a private radio service for personal gain and public benefit (0% chose this)
-
a public radio service used for public service communications (4% chose this)
-
a radiocommunication service for the purpose of self-training, intercommunication and technical investigation (96% chose this)
-
a private radio service intended only for emergency communications (0% chose this)
I = E/R is a mathematical equation describing
-
Ohm's Law (100% chose this)
-
Thevenin's Theorem (0% chose this)
-
Kirchoff's First Law (0% chose this)
-
Kirchoff's Second Law (0% chose this)
One GHz is equal to
-
1000 kHz (0% chose this)
-
10 MHz (0% chose this)
-
100 MHz (0% chose this)
-
1000 MHz (100% chose this)
The ability of a receiver to separate signals close in frequency is called its
-
noise figure (3% chose this)
-
sensitivity (13% chose this)
-
bandwidth (0% chose this)
-
selectivity (84% chose this)
In the block diagram of the receiver shown, the waveform produced by the "oscillator" would ideally be a
-
square wave (0% chose this)
-
pulsed wave (0% chose this)
-
sinewave (96% chose this)
-
hybrid frequency wave (4% chose this)
If ten resistors of equal value R are wired in parallel, the total resistance is
-
R (0% chose this)
-
10R (3% chose this)
-
10/R (25% chose this)
-
R/10 (72% chose this)
The voltage across a resistor carrying current can be calculated using the formula
-
E = I + R [voltage equals current plus resistance] (3% chose this)
-
E = I - R [voltage equals current minus resistance] (0% chose this)
-
E = I x R [voltage equals current times resistance] (90% chose this)
-
E = I / R [voltage equals current divided by resistance] (7% chose this)
A General Amateur Operator Certificate of Competency can be inspected by an authorised officer from the Ministry of Business, Innovation, and Employment
-
at any time (90% chose this)
-
on any business day (10% chose this)
-
before 9 p.m. (0% chose this)
-
only on public holidays (0% chose this)
These letters are generally used for the first letters in New Zealand amateur radio callsigns
-
ZS (4% chose this)
-
ZL (93% chose this)
-
VK (4% chose this)
-
LZ (0% chose this)
A switching system to use a single antenna for a separate transmitter and receiver should also
-
disable the unit not being used (76% chose this)
-
disconnect the antenna tuner (9% chose this)
-
ground the antenna on receive (12% chose this)
-
switch between power supplies (3% chose this)
In the block diagram shown, the connection between the SWR bridge and the antenna switch is normally a
-
twisted pair cable (4% chose this)
-
coaxial cable (96% chose this)
-
quarter-wave matching section (0% chose this)
-
short length of balanced ladder-line (0% chose this)
The signal "QSY?" means
-
shall I change to transmission on another frequency? (68% chose this)
-
shall I increase transmitter power? (5% chose this)
-
shall I relay to .... ? (8% chose this)
-
is my signal fading? (18% chose this)
The following unit in a DC power supply performs a smoothing operation
-
an electrolytic capacitor (74% chose this)
-
a fuse (0% chose this)
-
a crowbar (9% chose this)
-
a full-wave diode bridge (17% chose this)
The frequency limits of the �20 metre band� are
-
14.00 to 14.10 MHz (9% chose this)
-
14.00 to 14.45 MHz (3% chose this)
-
14.00 to 14.50 MHz (12% chose this)
-
14.00 to 14.35 MHz (76% chose this)
A harmonic of a signal transmitted at 3525 kHz would be expected to occur at
-
3573 kHz (7% chose this)
-
7050 kHz (87% chose this)
-
14025 kHz (3% chose this)
-
21050 kHz (3% chose this)
Increasing the number of turns on an inductor will make its inductance
-
decrease (13% chose this)
-
increase (87% chose this)
-
remain unchanged (0% chose this)
-
become resistive (0% chose this)
The block marked 'Rectifier' in the diagram is to
-
turn the AC voltage from the transformer into a fluctuating DC voltage (70% chose this)
-
rectify any waveform errors introduced by the transformer (5% chose this)
-
turn the sinewave output of the rectifier into a square wave (3% chose this)
-
smooth the DC waveform (22% chose this)
The correct phonetic code for the callsign VK5ZX is
-
victor kilowatt five zulu xray (10% chose this)
-
victor kilo five zulu xray (87% chose this)
-
victor kilo five zanzibar xray (0% chose this)
-
victoria kilo five zulu xray (3% chose this)
An amateur station must have a qualified operator
-
only when training another amateur (0% chose this)
-
whenever the station receiver is operated (6% chose this)
-
whenever the station is used for transmitting (84% chose this)
-
when transmitting and receiving (10% chose this)
A 50 hertz current in a wire means that
-
a potential difference of 50 volts exists across the wire (0% chose this)
-
the current flowing in the wire is 50 amperes (0% chose this)
-
the power dissipated in the wire is 50 watts (0% chose this)
-
a cycle is completed 50 times in each second (100% chose this)
The purpose of using three wires in the mains power cord and plug on amateur radio equipment is to
-
make it inconvenient to use (0% chose this)
-
prevent the chassis from becoming live in case of an internal short to the chassis (93% chose this)
-
prevent the plug from being reversed in the wall outlet (0% chose this)
-
prevent short circuits (7% chose this)
The organisation responsible for the International Radio Regulations is the
-
European Radiocommunications Office (4% chose this)
-
United Nations (0% chose this)
-
International Telecommunication Union (96% chose this)
-
European Telecommunication Standards Institute (0% chose this)
The following is a source of electrical energy
-
p-channel FET (0% chose this)
-
carbon resistor (0% chose this)
-
germanium diode (0% chose this)
-
lead acid battery (100% chose this)
The resistor which gives the greatest opposition to current flow is
-
230 ohm (0% chose this)
-
1.2 kilohm (3% chose this)
-
1600 ohm (10% chose this)
-
0.5 megohm (87% chose this)
The following material is considered to be a semiconductor
-
copper (7% chose this)
-
sulphur (0% chose this)
-
silicon (93% chose this)
-
tantalum (0% chose this)
One kilohm is
-
10 ohm (0% chose this)
-
0.01 ohm (0% chose this)
-
0.001 ohm (7% chose this)
-
1000 ohm (93% chose this)
Electromagnetic compatibility is
-
two antennas facing each other (0% chose this)
-
the ability of equipment to function satisfactorily in its own environment without introducing intolerable electromagnetic disturbances (90% chose this)
-
more than one relay solenoid operating simultaneously (3% chose this)
-
the inability of equipment to function satisfactorily together and produce tolerable electromagnetic disturbances (7% chose this)
The "split frequency" function on a transceiver allows the operator to
-
transmit on one frequency and receive on another (90% chose this)
-
monitor two frequencies simultaneously using a single loudspeaker (3% chose this)
-
monitor two frequencies simultaneously using two loudspeakers (7% chose this)
-
receive CW and SSB signals simultaneously on the same frequency (0% chose this)
If the qualified operator of an amateur radio station is absent overseas, the home station may be used by
-
any member of the immediate family to maintain contact with only the qualified operator (0% chose this)
-
any person with an appropriate General Amateur Operator Certificate of Competency (100% chose this)
-
the immediate family to communicate with any amateur radio operator (0% chose this)
-
the immediate family if a separate callsign for mobile use has been obtained by the absent operator (0% chose this)
The abbreviation �VHF� refers to the radio spectrum between
-
2 MHz and 10 MHz (0% chose this)
-
3 MHz and 30 MHz (6% chose this)
-
30 MHz and 300 MHz (84% chose this)
-
200 MHz and 2000 MHz (9% chose this)
The block marked 'Regulator' in the diagram is to
-
regulate the incoming mains voltage to a constant value (3% chose this)
-
ensure that the output voltage never exceeds a dangerous value (6% chose this)
-
keep the incoming frequency constant at 50 Hz (3% chose this)
-
keep the output voltage at a constant value (87% chose this)
The sensitivity of a receiver specifies
-
the bandwidth of the RF preamplifier (3% chose this)
-
the stability of the oscillator (6% chose this)
-
its ability to receive weak signals (87% chose this)
-
its ability to reject strong signals (3% chose this)
A Yagi antenna is said to have a power gain over a dipole antenna for the same frequency band because
-
it radiates more power than a dipole (3% chose this)
-
more powerful transmitters can use it (0% chose this)
-
it concentrates the radiation in one direction (93% chose this)
-
it can be used for more than one band (3% chose this)
An impure signal is found to have 2 kHz and 4 kHz components. This 4 kHz signal is
-
a fundamental of the 2 kHz signal (7% chose this)
-
a sub-harmonic of 2 kHz (0% chose this)
-
the DC component of the main signal (0% chose this)
-
a harmonic of the 2 kHz signal (93% chose this)
A low-pass filter for a high frequency transmitter output would
-
attenuate frequencies above 30 MHz (71% chose this)
-
pass audio frequencies below 3 kHz (11% chose this)
-
attenuate frequencies below 30 MHz (16% chose this)
-
pass audio frequencies above 3 kHz (3% chose this)
VHF or UHF signals transmitted towards a tall building are often received at a more distant point in another direction because
-
these waves are easily bent by the ionosphere (0% chose this)
-
these waves are easily reflected by objects in their path (100% chose this)
-
you can never tell in which direction a wave is travelling (0% chose this)
-
tall buildings have elevators (0% chose this)
An important difference between a common torch battery and a lead acid battery is that only the lead acid battery
-
has two terminals (0% chose this)
-
contains an electrolyte (15% chose this)
-
can be re-charged (85% chose this)
-
can be effectively discharged (0% chose this)
The current flowing through a resistor can be calculated by using the formula
-
I = E x R [current equals voltage times resistance] (10% chose this)
-
I = E / R [current equals voltage divided by resistance] (90% chose this)
-
I = E + R [current equals voltage plus resistance] (0% chose this)
-
I = E - R [current equals voltage minus resistance] (0% chose this)
The following can be adapted for use as a modem
-
an electronic keyer (3% chose this)
-
a spare transceiver (0% chose this)
-
a spare receiver (6% chose this)
-
a computer sound-card (90% chose this)
The following two electrical units multiplied together give the unit "watt"
-
volt and ampere (97% chose this)
-
volt and farad (3% chose this)
-
farad and henry (0% chose this)
-
ampere and henry (0% chose this)
An amateur station may transmit unidentified signals
-
when making a brief test not intended for reception by anyone else (12% chose this)
-
when conducted on a clear frequency when no interference will be caused (6% chose this)
-
when the meaning of transmitted information must be obscured to preserve secrecy (0% chose this)
-
never, such transmissions are not permitted (82% chose this)
As a New Zealand amateur radio operator you
-
must regularly operate using dry batteries (0% chose this)
-
should use shortened antennas (0% chose this)
-
may train for and support disaster relief activities (100% chose this)
-
must always have solar-powered equipment in reserve (0% chose this)
You must keep the following document at your amateur station
-
your General Amateur Operator Certificate of Competency (100% chose this)
-
a copy of the Rules and Regulations for the Amateur Service (0% chose this)
-
a copy of the Radio Amateur's Handbook for instant reference (0% chose this)
-
a chart showing the amateur radio bands (0% chose this)
The abbreviation AGC means
-
attenuating gain capacitor (0% chose this)
-
automatic gain control (97% chose this)
-
anode-grid capacitor (3% chose this)
-
amplified grid conductance (0% chose this)
Four good electrical insulators are
-
plastic, rubber, wood, carbon (6% chose this)
-
glass, wood, copper, porcelain (0% chose this)
-
paper, glass, air, aluminium (6% chose this)
-
glass, air, plastic, porcelain (88% chose this)
As a New Zealand amateur radio operator you may communicate with
-
only amateur stations within New Zealand (0% chose this)
-
only stations running more than 500w PEP output (3% chose this)
-
only stations using the same transmission mode (3% chose this)
-
other amateur stations world-wide (93% chose this)
The age when an amateur radio operator is required to surrender the General Amateur Operator Certificate of Competency is
-
65 years (0% chose this)
-
70 years (0% chose this)
-
75 years (0% chose this)
-
there is no age limit (100% chose this)
A low-pass filter may be used in an amateur radio installation
-
to attenuate signals lower in frequency than the transmission (15% chose this)
-
to attenuate signals higher in frequency than the transmission (82% chose this)
-
to boost the output power of the lower frequency transmissions (3% chose this)
-
to boost the power of higher frequency transmissions (0% chose this)
Bandplans showing the transmission modes for New Zealand amateur radio bands are developed and published for the mutual respect and advantage of all operators
-
to ensure that your operations do not impose problems on other operators and that their operations do not impact on you (100% chose this)
-
to keep experimental developments contained (0% chose this)
-
to reduce the number of modes in any one band (0% chose this)
-
to keep overseas stations separate from local stations (0% chose this)
Peak envelope power (PEP) output is the
-
average power output at the crest of the modulating cycle (74% chose this)
-
total power contained in each sideband (8% chose this)
-
carrier power output (8% chose this)
-
transmitter power output on key-up condition (11% chose this)
The type of atmospheric layers which will best return signals to earth are
-
oxidised layers (0% chose this)
-
heavy cloud layers (0% chose this)
-
ionised layers (93% chose this)
-
sun spot layers (7% chose this)
In the transmitter block diagram shown, the "VFO" is
-
a voice frequency oscillator (10% chose this)
-
a varactor fixed oscillator (0% chose this)
-
a virtual faze oscillator (0% chose this)
-
a variable frequency oscillator (90% chose this)
Two 120 ohm resistors are arranged in parallel to replace a faulty resistor. The faulty resistor had an original value of
-
15 ohm (0% chose this)
-
30 ohm (9% chose this)
-
60 ohm (88% chose this)
-
120 ohm (3% chose this)
A simple transmitter requires a 50 ohm dummy load. You can fabricate this from
-
four 300 ohm resistors in parallel (9% chose this)
-
five 300 ohm resistors in parallel (3% chose this)
-
six 300 ohm resistors in parallel (85% chose this)
-
seven 300 ohm resistors in parallel (3% chose this)
An ammeter should not be connected directly across the terminals of a 12 volt car battery because
-
the resulting high current will probably destroy the ammeter (94% chose this)
-
no current will flow because no other components are in the circuit (6% chose this)
-
the battery voltage will be too low for a measurable current to flow (0% chose this)
-
the battery voltage will be too high for a measurable current to flow (0% chose this)
An amateur radio operator must be able to
-
converse in the languages shown on the Certificate of Competency (0% chose this)
-
read Morse code at 12 words-per-minute (0% chose this)
-
monitor standard frequency transmissions (0% chose this)
-
verify that transmissions are within an authorised frequency band (100% chose this)
The unit of impedance is the
-
ampere (0% chose this)
-
farad (3% chose this)
-
henry (19% chose this)
-
ohm (78% chose this)
One way to operate a 3 volt bulb from a 9 volt supply is to connect it in
-
series with the supply (3% chose this)
-
parallel with the supply (9% chose this)
-
series with a resistor (88% chose this)
-
parallel with a resistor (0% chose this)
The Morse code signal SOS is sent by a station
-
with an urgent message (0% chose this)
-
in grave and imminent danger and requiring immediate assistance (100% chose this)
-
making a report about a shipping hazard (0% chose this)
-
sending important weather information (0% chose this)
One mA is
-
one millionth of one ampere (9% chose this)
-
one thousandth of one ampere (91% chose this)
-
one tenth of one ampere (0% chose this)
-
one millionth of admittance (0% chose this)
A 5 ohm and a 10 ohm resistor are wired in series and connected to a 15 volt power supply. The current flowing from the power supply is
-
0.5 ampere (8% chose this)
-
1 ampere (81% chose this)
-
2 ampere (6% chose this)
-
15 ampere (6% chose this)
If you hear distress traffic and are unable to render assistance, you should
-
maintain watch until you are certain that assistance is forthcoming (97% chose this)
-
enter the details in the log book and take no further action (0% chose this)
-
take no action (0% chose this)
-
tell all other stations to cease transmitting (3% chose this)
The figures normally used in New Zealand amateur radio callsigns are
-
any two-digit number, 45 through 99 (17% chose this)
-
any two-digit number, 22 through 44 (0% chose this)
-
a single digit, 5 through 9 (14% chose this)
-
a single digit, 1 through 4 (69% chose this)
This callsign could be allocated to an amateur radio operator in New Zealand
-
ZK-CKF (3% chose this)
-
ZLC5 (6% chose this)
-
ZL2HF (91% chose this)
-
ZMX4432 (0% chose this)
A person in distress
-
must use correct communication procedures (0% chose this)
-
may use any means available to attract attention (94% chose this)
-
must give position with a grid reference (6% chose this)
-
must use allocated safety frequencies (0% chose this)
International communications on behalf of third parties may be transmitted by an amateur station only if
-
prior remuneration has been received (0% chose this)
-
such communications have been authorised by the countries concerned (88% chose this)
-
the communication is transmitted in secret code (3% chose this)
-
English is used to identify the station at the end of each transmission (9% chose this)
A current of 5 ampere in a 50 ohm resistance produces a potential difference of
-
20 volt (11% chose this)
-
45 volt (0% chose this)
-
55 volt (3% chose this)
-
250 volt (86% chose this)
The transmitter power output for amateur stations at all times is
-
25 watt PEP minimum output (0% chose this)
-
that needed to overcome interference from other stations (0% chose this)
-
1000 watt PEP maximum (6% chose this)
-
the minimum power necessary to communicate and within the terms of the amateur radio GURL (94% chose this)
Before explaining to a neighbour that the reported interference is due to a lack of immunity in the neighbour's electronic equipment
-
disconnect all your equipment from their power sources (3% chose this)
-
write a letter to the MBIE (0% chose this)
-
make sure that there is no interference on your own domestic equipment (97% chose this)
-
ignore all complaints and take no action (0% chose this)
A dummy antenna
-
attenuates a signal generator to a desirable level (0% chose this)
-
provides more selectivity when a transmitter is being tuned (3% chose this)
-
matches an AF generator to the receiver (0% chose this)
-
duplicates the characteristics of an antenna without radiating signals (97% chose this)
You identify your amateur station by transmitting your
-
"handle" (0% chose this)
-
callsign (100% chose this)
-
first name and your location (0% chose this)
-
full name (0% chose this)
Two 100 ohm resistors connected in parallel are wired in series with a 10 ohm resistor. The total resistance of the combination is
-
60 ohms (91% chose this)
-
180 ohms (3% chose this)
-
190 ohms (0% chose this)
-
210 ohms (6% chose this)
Six identical 2-volt bulbs are connected in series. The supply voltage to cause the bulbs to light normally is
-
12 V (94% chose this)
-
1.2 V (0% chose this)
-
6 V (3% chose this)
-
2 V (3% chose this)
Unqualified persons in your family cannot transmit using your amateur station if they are alone with your equipment because they must
-
not use your equipment without your permission (0% chose this)
-
hold a General Amateur Operator Certificate of Competency before they are allowed to be operators (100% chose this)
-
first know how to use the right abbreviations and Q signals (0% chose this)
-
first know the right frequencies and emissions for transmitting (0% chose this)
The substance which will most readily allow an electric current to flow is
-
an insulator (0% chose this)
-
a conductor (97% chose this)
-
a resistor (3% chose this)
-
a dielectric (0% chose this)
In digital communications, FSK stands for
-
phase selection keying (0% chose this)
-
final section keying (0% chose this)
-
frequency shift keying (100% chose this)
-
final signal keying (0% chose this)
The main characteristic of a vertical antenna is that it
-
requires few insulators (0% chose this)
-
is very sensitive to signals coming from horizontal aerials (9% chose this)
-
receives signals from all points around it equally well (91% chose this)
-
is easy to feed with TV ribbon feeder (0% chose this)
The watt is the unit of
-
power (100% chose this)
-
magnetic flux (0% chose this)
-
electromagnetic field strength (0% chose this)
-
breakdown voltage (0% chose this)
An Amateur Station is one which is
-
operated by the holder of a General Amateur Operator Certificate of Competency on the amateur radio bands (91% chose this)
-
owned and operated by a person who is not engaged professionally in radio communications (6% chose this)
-
used exclusively to provide two-way communication in connection with activities of amateur sporting organisations (0% chose this)
-
used primarily for emergency communications during floods, earthquakes and similar disasters. (3% chose this)
Before operating an amateur station in a motor vehicle, you must
-
give the Land Transport Authority the vehicle's licence plate number (3% chose this)
-
inform the Ministry of Business, Innovation, and Employment (0% chose this)
-
hold a current General Amateur Operator Certificate of Competency (97% chose this)
-
obtain an additional callsign (0% chose this)
Resistors of 10, 270, 3900, and 100 ohm are connected in series. The total resistance is
-
9 ohm (0% chose this)
-
3900 ohm (0% chose this)
-
4280 ohm (100% chose this)
-
10 ohm (0% chose this)
The term "harmful interference" means
-
interference which obstructs or repeatedly interrupts radiocommunication services (97% chose this)
-
an antenna system which accidentally falls on to a neighbour's property (0% chose this)
-
a receiver with the audio volume unacceptably loud (0% chose this)
-
interference caused by a station of a secondary service (3% chose this)
You can safely remove an unconscious person from contact with a high voltage source by
-
pulling an arm or a leg (0% chose this)
-
wrapping the person in a blanket and pulling to a safe area (6% chose this)
-
calling an electrician (0% chose this)
-
turning off the high voltage and then removing the person (94% chose this)
The ohm is the unit of
-
supply voltage (0% chose this)
-
electrical pressure (0% chose this)
-
current flow (14% chose this)
-
electrical resistance (86% chose this)
A General Amateur Operator Certificate of Competency
-
can never be revoked (0% chose this)
-
gives a waiver over copyright (0% chose this)
-
does not confer on its holder a monopoly on the use of any frequency or band (100% chose this)
-
can be readily transferred (0% chose this)
The plastic coating formed around wire is
-
an insulator (97% chose this)
-
a conductor (3% chose this)
-
an inductor (0% chose this)
-
a magnet (0% chose this)
When someone in the neighbourhood complains of TVI it is wise to
-
deny all responsibility (0% chose this)
-
immediately blame the other equipment (0% chose this)
-
inform all the other neighbours (3% chose this)
-
check your log to see if it coincides with your transmissions (97% chose this)
These magnetic poles repel
-
unlike (3% chose this)
-
like (94% chose this)
-
positive (3% chose this)
-
negative (0% chose this)
In the block diagram of the receiver shown, the "AF amplifier"
-
rejects AM and RTTY signals (0% chose this)
-
amplifies audio frequency signals (100% chose this)
-
has a very narrow passband (0% chose this)
-
restores ambiance to the audio (0% chose this)
The following two quantities should be multiplied together to find power
-
resistance and capacitance (0% chose this)
-
voltage and current (97% chose this)
-
voltage and inductance (3% chose this)
-
inductance and capacitance (0% chose this)
"VOX" stands for
-
volume operated extension speaker (0% chose this)
-
voice operated transmit (97% chose this)
-
variable oscillator transmitter (0% chose this)
-
voice operated expander (3% chose this)
You must have a General Amateur Operator Certificate of Competency to
-
transmit on public-service frequencies (0% chose this)
-
retransmit shortwave broadcasts (3% chose this)
-
repair radio equipment (0% chose this)
-
transmit in bands allocated to the Amateur Service (97% chose this)
An Amateur Station is a station
-
in the public radio service (3% chose this)
-
using radiocommunications for a commercial purpose (3% chose this)
-
using equipment for training new radiocommunications operators (3% chose this)
-
in the Amateur Service (92% chose this)
The following could power a solid-state 10 watt VHF transceiver
-
a 12 volt car battery (89% chose this)
-
6 penlite cells in series (3% chose this)
-
a 12 volt, 500 mA plug-pack (0% chose this)
-
a 6 volt 10 Amp-hour Gel cell. (8% chose this)
A coaxial feedline is constructed from
-
a single conductor (5% chose this)
-
two parallel conductors separated by spacers (0% chose this)
-
braid and insulation around a central conductor (92% chose this)
-
braid and insulation twisted together (3% chose this)
In the transmitter block diagram shown, the "linear amplifier"
-
has all components arranged in-line (0% chose this)
-
amplifies the modulated signal with no distortion (94% chose this)
-
aligns the two sidebands correctly (0% chose this)
-
removes any unwanted amplitude modulation from the signal (6% chose this)
An element which falls somewhere between being an insulator and a conductor is called a
-
P-type conductor (0% chose this)
-
intrinsic conductor (3% chose this)
-
semiconductor (94% chose this)
-
N-type conductor (3% chose this)
An amateur station may be closed down at any time by
-
a demand from an irate neighbour experiencing television interference (0% chose this)
-
a demand from an authorised official of the Ministry of Business, Innovation, and Employment (100% chose this)
-
an official from your local council (0% chose this)
-
anyone until your aerials are made less unsightly (0% chose this)
When living in a densely-populated area, it is wise to
-
always use maximum transmitter output power (0% chose this)
-
use the minimum transmitter output power necessary (100% chose this)
-
only transmit during popular television programme times (0% chose this)
-
point the beam at the maximum number of television antennas (0% chose this)
This rule applies if two amateur radio stations want to use the same frequency
-
the operator with the newer qualification must yield the frequency to the more experienced operator (0% chose this)
-
the station with the lower power output must yield the frequency to the station with the higher power output (0% chose this)
-
both stations have an equal right to operate on the frequency, the second-comer courteously giving way after checking that the frequency is in use (100% chose this)
-
stations in ITU Regions 1 and 2 must yield the frequency to stations in Region 3 (0% chose this)
An electrical insulator
-
lets electricity flow through it in one direction (0% chose this)
-
does not let electricity flow through it (97% chose this)
-
lets electricity flow through it when light shines on it (0% chose this)
-
lets electricity flow through it (3% chose this)
When interference to the reception of radiocommunications is caused by the operation of an amateur station, the station operator
-
must immediately comply with any action required by the Ministry of Business, Innovation, and Employment to prevent the interference (97% chose this)
-
may continue to operate with steps taken to reduce the interference when the station operator can afford it (0% chose this)
-
may continue to operate without restrictions (0% chose this)
-
is not obligated to take any action (3% chose this)
Messages from an amateur station in one of the following are expressly forbidden
-
ASCII (0% chose this)
-
International No. 2 code (0% chose this)
-
Baudot code (3% chose this)
-
secret cipher (97% chose this)
A mains operated DC power supply
-
converts DC from the mains into AC of the same voltage (6% chose this)
-
converts energy from the mains into DC for operating electronic equipment (94% chose this)
-
is a diode-capacitor device for measuring mains power (0% chose this)
-
is a diode-choked device for measuring inductance power (0% chose this)
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