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Subel. B
6 questions
Subelement B

Transmitting Systems

Section 12

Magnetrons

High voltage is applied to what element of the magnetron?

  • The waveguide.
  • The anode.
  • The plate cap.
  • Correct Answer
    The cathode.

For safety reasons the anode of the Magnetron is grounded and the high voltage is applied to the cathode, so Answer D. is the right answer.

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The characteristic of the magnetron output pulse that relates to accurate range measurement is its:

  • Amplitude.
  • Decay time.
  • Correct Answer
    Rise time.
  • Duration.

The range to a target is calculated nased on the time elapsed between the rising edge of the transmitted pulse and the rising edge of the received pulse, so a fast rise time in the Magnetron's transmitted pulse is essential to accurate ranging and Answer C. is the right answer.

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What device is used as a transmitter in a marine RADAR system?

  • Correct Answer
    Magnetron.
  • Klystron.
  • Beam-powered pentode.
  • Thyratron.

The Magnetron generates the RF power in a RADAR System so Answer A. is the right answer.

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The magnetron is:

  • A type of diode that requires an internal magnetic field.
  • A triode that requires an external magnetic field.
  • Used as the local oscillator in the RADAR unit.
  • Correct Answer
    A type of diode that requires an external magnetic field.

Without a magnetic field the Magneron is a vacuum tube with just an anode and a cathode, i.e. a regular diode, so Answer D. is the right answer.

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A negative voltage is commonly applied to the magnetron cathode rather than a positive voltage to the magnetron anode because:

  • The cathode must be made neutral to force electrons into the drift area.
  • A positive voltage would tend to nullify or weaken the magnetic field.
  • Correct Answer
    The anode can be operated at ground potential for safety reasons.
  • The cavities might not be shock-excited into oscillation by a positive voltage.
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The anode of a magnetron is normally maintained at ground potential:

  • Because it operates more efficiently that way.
  • Correct Answer
    For safety purposes.
  • Never. It must be highly positive to attract the electrons.
  • Because greater peak-power ratings can be achieved.
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