Canadian Basic Qualification pool, section B-005-002

Subelement B-005

B-005

Section B-005-002

B-005-002-001

Which of these groups lists three good electrical conductors?

A.
Copper, aluminum and paper
B.
Gold, silver and wood
C.
Copper, gold and mica
Correct Answer
D.
Gold, silver and aluminum

B-005-002-001

Wood, paper and mica do NOT conduct electricity. The best conductors, in descending order, are silver, copper, gold and aluminum.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-002-002

Which of these groups lists three good electrical insulators?

A.
Wood, copper and porcelain
B.
Plastic, wood and carbon
C.
Teflon, mica and aluminum
Correct Answer
D.
Glass, air and porcelain

B-005-002-002

Copper and aluminum are CONDUCTORS. Carbon is a poor conductor, it is used to fabricate resistors.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-002-003

What do we call the flow of electric charge in a circuit?

Correct Answer
A.
Current
B.
Voltage
C.
Resistance
D.
Capacitance

B-005-002-003

Current is the flow of electrons (charged particles) in a circuit. Voltage is the force that pushes the electrons. Resistance is the opposition encountered.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-002-004

What is the best conductor among the following materials?

Correct Answer
A.
Copper
B.
Carbon
C.
Aluminum
D.
Silicon

B-005-002-004

The best conductors, in descending order, are silver, copper, gold and aluminum. Carbon is a poor conductor, it is used to fabricate resistors. Silicon is used to make 'semiconductors'.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-002-005

Which of these types of materials readily allows the flow of electric current?

A.
Semiconductor
B.
Dielectric
C.
Insulator
Correct Answer
D.
Conductor

B-005-002-005

As the name implies, a 'conductor' readily passes electrical current. An Insulator ( synonym = dielectric ) does not let current flow. A resistor conducts but badly.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-002-006

What electrical property causes an object to conduct electricity very well?

Correct Answer
A.
Low resistance
B.
Low capacitance
C.
Low reluctance
D.
Low admittance

B-005-002-006

Conductors have LOW resistance. They do not oppose current flow.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-002-007

The letter "R" is the symbol for:

Correct Answer
A.
resistance
B.
reluctance
C.
impedance
D.
reactance

B-005-002-007

R = Resistance, Z = Impedance, X = Reactance.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-002-008

What is the inverse of resistance?

A.
Reactance
B.
Reluctance
Correct Answer
C.
Conductance
D.
Permeability

B-005-002-008

Reciprocal = 'the inverse of something'. 1 over resistance yields CONDUCTANCE. Low resistance implies high conductance. High resistance implies little conductance.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-002-009

What is a voltage drop?

Correct Answer
A.
The loss of voltage caused by the flow of current through a circuit
B.
Any point in a circuit that has zero voltage
C.
The difference in voltage at the output terminals of a transformer
D.
The voltage output of a step-down transformer

B-005-002-009

As current flows through electronic components, some voltage is 'lost'. Remember voltage as 'pressure', there is more 'pressure' before a resistor than after it: this represents a 'voltage drop'.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-002-010

The resistance of a conductor changes with:

Correct Answer
A.
temperature
B.
voltage
C.
current
D.
humidity

B-005-002-010

Temperature affects components and conductors.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-002-011

Which term describes the direction of current in a DC circuit?

A.
Phase
Correct Answer
B.
Polarity
C.
Polarization
D.
Directivity

B-005-002-011

When connecting an electronic circuit to a source of DC voltage, you must respect the polarity: i.e., positive terminals together and negative terminals together.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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