MICROWAVE COMMUNICATION QUIZ

A high-power microwave pulse of the order of megawatts can be generated by a

Magnetron

Traveling-wave tube

Reflex klystron

Gunn diode

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Which of the following permits a microwave signal to travel in one direction with virtually no loss, but severely attenuates any signal attempting to travel in the reverse direction?

Wave trap

Circulator

Tunnel diode

Isolator

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When used in conjunction with a radar set, the purpose of an echo box is to provide an artificial target.

Tune the magnetron to the correct frequency

To the tone of the pulse repetition

Which may be used to tune the radar receiver

Which may be used to tune the radar synchronizer

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The frequency of the oscillation generated by a magnetron, is mainly determined by

The dimension of each cavity resonator

The number of the cavity resonators

The flux density of the external magnet

The ratio of the dc cathode voltage to the magnetic flux density

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Which of the following is used as a high power microwave oscillator?

Thyratron

Magnetron

Reflex-klystron

Klystron

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In microwave transmission using digital radio, what causes most intersymbol interference?

Delayed spreading

Slow fading

Random Doppler shift

Rayleigh fading

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The coarse frequency adjustment of a reflex klystron is accomplished by

An adjustment in the synchronizer

Adjusting the flexible wall of the resonant cavity

The AFC system

Varying the repeller voltage

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Which of the following is used as an oscillator device in the SHF band?

Tunnel diode

Klystron tube

Thyratron tube

Both B and C

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Oscillators of a klystron tube are maintained

By circulating bunches of electrons within the cavities.

By feedback between the accelerating grid and the repeller

By bunches of electrons passing the cavity grids

By plate-to-cathode feedback

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In a pulsed radar set, the STC circuit is used to

Vary the pulse frequency in order to control the maximum target

Improve the target bearing resolution

Increases receiver sensitivity for echoes from targets

Reduce interference from the effects of sea return

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