Related Questions

In a pulsed radar set, the STC circuit is used to
A Improve the target bearing resolution
B Increases receiver sensitivity for echoes from targets
C Vary the pulse frequency in order to control the maximum target
D Reduce interference from the effects of sea return
The coarse frequency adjustment of a reflex klystron is accomplished by
A The AFC system
B Adjusting the flexible wall of the resonant cavity
C An adjustment in the synchronizer
D Varying the repeller voltage
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
When it is desired that short-range targets be clearly seen on a pulsed-radar set, it is important that the receiver and display system have
A A long time constant
B Low-pass filters
C The shortest possible time
D The restricted high-frequency response
In a pulsed radar set, the function of the duplexer is to
A Aid in calibrating the display unit
B Prevent frequency drift in the klystron
C Allow the transmitter and the receiver to operate from a common antenna
D All of these
To achieve good bearing resolution when using a pulsed-radar set, an important requirement is
A A narrow, antenna-beam width in the vertical plane
B A narrow, antenna-beam width in the horizontal plane
C A low repetition rate
D A high duty cycle
Which of the following is used as an oscillator device in the SHF band?
A Thyratron tube
B Tunnel diode
C Klystron tube
D Both B and C
A thin layer of dirt and grime coverts the reflecting surface of the parabolic dish of a radar set. The particular effect on the performance of the radar will be
A A decrease in range
B A reduction in horizontal resolution
C No noticeable effect
D A decrease in gain
Klystron oscillators are most often used in the frequency range of
A 300 to 3000 MHz
B 3000 to 30000 MHz
C 30 to 30000 MHz
D 10 to 10000 MHz
Oscillators of a klystron tube are maintained
A By bunches of electrons passing the cavity grids
B By plate-to-cathode feedback
C By feedback between the accelerating grid and the repeller
D By circulating bunches of electrons within the cavities.

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