Exercise: Communication Systems

Questions for: Communication Systems

Which of the following circuits cannot be demodulate SSB?
A:
Product detector
B:
Balanced modulator
C:
Phase discriminator
D:
BFO
Answer: C
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An ungrounded antenna near the ground
A:
is horizontally polarized
B:
acts as an antenna array
C:
acts as a single antenna of twice the height
D:
is not likely to need an earth mat
Answer: C
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For a good public address system the sound intensity at the farthest point should be at least
A:
20 dB over threshold of hearing
B:
40 dB over threshold of hearing
C:
80 dB over threshold of hearing
D:
120 dB over threshold of hearing
Answer: C
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Companding is used
A:
to overcome quantising noise in PCM
B:
in PWM receivers to reduce impulse noise
C:
to protect small signals in PCM from quantising noise
D:
none of the above
Answer: B
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In telephone, the dial tone has a frequency of
A:
5 Hz
B:
15 Hz
C:
33 Hz
D:
233 Hz
Answer: C
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