Exercise: Communication Systems

Questions for: Communication Systems

Which one of the following is not necessarily an advantage of the phase cancellation method of obtaining SSB over the filter method?
A:
It is possible to generate SSB at any frequency
B:
SSB with lower audio frequencies present can be generated
C:
Switching from one sideband to other is simpler
D:
There are more balanced modulators; therefore the carrier is suppressed better
Answer: D
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Maximum undistorted power output of a transmitter is obtained when its modulation is __________ percent.
A:
more than 100
B:
100
C:
less than 100
D:
50
Answer: B
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If fh(t) is Hilbert transform of f(t), then Hilbert transform of fh(t) is
A:
-f(t)
B:
+f(t)
C:
f2(t)
D:
f(t)
Answer: A
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A frequency doubler has an FM signal input at 13 MHz with a deviation of 5 kHz. The output frequency of the carrier will be
A:
26 kHz
B:
260 kHz
C:
26 MHz
D:
260 MHz
Answer: D
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In radar PRF depends on maximum range.
A:
True
B:
False
C:
D:
Answer: A
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