Exercise: Communication Systems

Questions for: Communication Systems

All of the output pulses are at full transmitter power for a strong signal in all of the following except
A:
PWM
B:
PAM
C:
PFM
D:
PCM
Answer: B
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The input to a coherent detector is DSB - SC signal plus noise. The noise at the detector output is
A:
in phase component
B:
quadrature component
C:
zero
D:
the envelope
Answer: A
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A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 μ sec. Which of the following frequencies will not be in the modulated signal?
A:
990 kHz
B:
1010 kHz
C:
1020 kHz
D:
1030 kHz
Answer: C
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Radiation resistance of an antenna is a
A:
dc resistance
B:
ac resistance
C:
either (a) or (b)
D:
none of the above
Answer: B
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The number of spectral component when two cosine waves are multiplied of different frequency
A:
1
B:
2
C:
8
D:
4
Answer: D
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