8-B-12: Magnetrons
8-12B1:
High voltage is applied to what element of the magnetron?
The cathode.
The waveguide.
The anode.
The plate cap.
8-12B2:
The characteristic of the magnetron output pulse that relates to accurate range measurement is its:
Rise time.
Amplitude.
Decay time.
Duration.
8-12B3:
What device is used as a transmitter in a marine RADAR system?
Magnetron.
Klystron.
Beam-powered pentode.
Thyratron.
8-12B4:
The magnetron is:
A type of diode that requires an external magnetic field.
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.
8-12B5:
A negative voltage is commonly applied to the magnetron cathode rather than a positive voltage to the magnetron anode because:
The anode can be operated at ground potential for safety reasons.
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.
The cavities might not be shock-excited into oscillation by a positive voltage.
8-12B6:
The anode of a magnetron is normally maintained at ground potential:
For safety purposes.
Because it operates more efficiently that way.
Never. It must be highly positive to attract the electrons.
Because greater peak-power ratings can be achieved.
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