Exercise: Communication Systems

Questions for: Communication Systems

If M (jω) = £[m(t)] where £ denotes Fourier transform, then £[m(t) cos ωct] =
A:
M (jω + jωc)
B:
M (jω - jωc)
C:
M (jω + jωc) + M (jω - jωc)
D:
[M (jω + jωc) + M (jω - jωc)]
Answer: D
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Assertion (A): If a carrier is modulated by three sine waves and m1, m2, m3 are the modulation indices, the total modulation index mt is
mt = (m12 + m22 + m32)0.5

Reason (R): An AM, higher the level of modulation, lower is the audio power required to produce modulation.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: C
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The number of spectral component of impulse wave is
A:
1
B:
0
C:
2
D:
∞
Answer: D
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Which of the following oscillator is not in FM?
A:
Crystal oscillator
B:
Hartley oscillator
C:
Colpitts oscillator
D:
All of the above
Answer: B
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Frequency frogging is used in a carrier system to
A:
conserve frequencies
B:
reduce distortion
C:
reduce cross talk
D:
none of the above
Answer: C
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