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Subel. B
A
60 questions
B
48 questions
C
60 questions
D
60 questions
E
30 questions
F
42 questions
6 questions
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Subelement B
Transmitting Systems
Section 13
Modulation
8
13B1
In a solid-state RADAR modulator, the duration of the transmitted pulse is determined by:
A.
The thyratron.
B.
The magnetron voltage.
Correct Answer
C.
The pulse
forming
network
.
D.
The trigger pulse.
8
13B1
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8
13B2
The modulation frequency of most RADAR systems is between:
Correct Answer
A.
60
and
500
Hz.
B.
3000 and 6000 Hz.
C.
1500 and 7500 Hz.
D.
1000 and 3000 Hz.
8
13B2
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8
13B3
A shipboard RADAR uses a PFN driving a magnetron cathode through a step-up transformer. This results in which type of modulation?
A.
Frequency modulation.
B.
Amplitude modulation.
C.
Continuous Wave (CW) modulation.
Correct Answer
D.
Pulse
modulation.
8
13B3
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8
13B4
In a pulse modulated magnetron what device determines the shape and width of the pulse?
Correct Answer
A.
Pulse
Forming
Network
.
B.
Thyratron.
C.
LC parallel circuit.
D.
Dimensions of the magnetron cavity.
8
13B4
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8
13B5
What device(s) may act as the modulator of a RADAR system?
A.
Magnetron.
B.
Klystron.
C.
Video amplifier.
Correct Answer
D.
Thyratron
or a
silicon
-
controlled
rectifier
(
SCR
).
8
13B5
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8
13B6
The purpose of a modulator in the transmitter section of a RADAR is to:
A.
Improve bearing resolution.
Correct Answer
B.
Provide the
correct
waveform
to the
transmitter
.
C.
Prevent sea return.
D.
Control magnetron power output.
8
13B6
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