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Microwave Communication

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

Klystron tube
Both B and C
Tunnel diode
Thyratron tube

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Microwave Communication
The coarse frequency adjustment of a reflex klystron is accomplished by

The AFC system
Varying the repeller voltage
An adjustment in the synchronizer
Adjusting the flexible wall of the resonant cavity

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

Reflex klystron
Gunn diode
Magnetron
Traveling-wave tube

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Microwave Communication
A reflex klystron is oscillating at the frequency of its resonant cavity. If the reflector voltage is made slightly less negative, the

Oscillation will cease
Bunching would occur earlier in time
Output power would increase
The frequency will decrease

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Microwave Communication
Coupling into and out of a traveling-wave tube can be accompanied by a

All of these
Waveguide match
Direct coax-helix match
Cavity match

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Microwave Communication
__________ is the progressive decrease of signal strength with increasing distance.

Radiation
Attenuation
Propagation
Modulation

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