Exercise: Communication Systems

Questions for: Communication Systems

The ratio for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is
A:
mf2
B:
m2f
C:
mf3
D:
m3f
Answer: B
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A pre-emphasis circuit provides extra noise immunity by
A:
converting the phase modulation of FM
B:
preamplifying the whole audio band
C:
amplifying the higher audio frequencies
D:
boosting the pass frequencies
Answer: C
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When ωm is the modulation frequency in frequency modulation, the modulation index is proportional to
A:
ωm
B:
ω2m
C:
1/ωm
D:
1/ω2m
Answer: C
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Short circuited stubs are preferred to O.C stubs because
A:
O.C stubs are incapable of giving full range of reactances
B:
O.C stubs are liable to radiate
C:
O.C stubs are difficult to make and connect
D:
none of the above
Answer: B
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A wave is frequency modulated with an index of 0.1 and its frequency is multiplied by 8 times, the modulation index is
A:
not changed
B:
decreased 8 times
C:
increased 4 times
D:
increased 8 times
Answer: A
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