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Subel. C
A
60 questions
B
48 questions
C
60 questions
D
60 questions
E
30 questions
F
42 questions
6 questions
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28
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Subelement C
Receiving Systems
Section 28
Miscellaneous
8
28C1
The purpose of the discriminator circuit in a RADAR set is to:
A.
Discriminate against nearby objects.
B.
Discriminate against two objects with very similar bearings.
Correct Answer
C.
Generate
a
corrective
voltage
for
controlling
the
frequency
of the
klystron
local
oscillator
.
D.
Demodulate or remove the intelligence from the FM signal.
8
28C1
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8
28C2
The MTI circuit:
A.
Acts as a mixer in a RADAR receiver.
Correct Answer
B.
Is a
filter
, which
blocks
out
stationary
targets, allowing only moving targets to be
detected
.
C.
Is used to monitor transmitter interference.
D.
Will pick up targets, which are not in motion.
8
28C2
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8
28C3
Where is a RF attenuator used in a RADAR unit?
A.
Between the antenna and the receiver.
B.
Between the magnetron and the antenna.
Correct Answer
C.
Between the magnetron and the AFC section of the receiver.
D.
Between the AFC section and the klystron.
8
28C3
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8
28C4
The condition known as "glint" refers to a shifting of clutter with each RADAR pulse and can be caused by a:
Correct Answer
A.
Improperly
functioning
MTI
filter
.
B.
Memory failure.
C.
Low AFC voltage.
D.
Interference from electrical equipment.
8
28C4
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8
28C5
An ion discharge (TR) cell is used to:
A.
Protect the transmitter from high SWRs.
B.
Lower the noise figure of the receiver.
C.
Tune the local oscillator of the RADAR receiver.
Correct Answer
D.
Protect the receiver
mixer
during the
transmit
pulse
.
8
28C5
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8
28C6
When the receiver employs an MTI circuit:
A.
The receiver gain increases with time.
Correct Answer
B.
Only moving
targets
will be
displayed
.
C.
The receiver AGC circuits are disabled.
D.
Ground clutter will be free of "rabbits."
8
28C6
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