A reflex klystron is oscillating at the frequency of its resonant cavity. If the reflector voltage is made slightly less negative, the
A). Oscillation will cease
B). Output power would increase
C). The frequency will decrease
D). Bunching would occur earlier in time
Theoretically electromagnetic radiation field strength varies in inverse proportion to the square of the distance, but when atmospheric attenuation effects and the absorption of the terrain are taken into account the attenuation can be as high as the inverse ___________ power of the distance.
A). Third
B). Fourth
C). Fifth
D). Sixth
In a radar-set receiver, the usual mixer stage is
A). And FET
B). A tunnel diode
C). A silicon crystal
D). A Rochelle salts crystal
The Gunn diode oscillator
A). Is capable of generating continuous microwave power of the order of kilowatt
B). Generates frequencies which are below 100 MHz
C). Operates over a positive resistance characteristic
D). Depends on the formation of charge domain
What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
A). To accelerate the electron
B). To velocity modulate the electron beam
C). To keep the electrons from spreading out
D). To slow down the signal on the helix