Exercise: Communication Systems

Questions for: Communication Systems

Assertion (A): In FM the frequency of the carrier is varied by the modulating voltage

Reason (R): FM and PM are two forms of angle 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: B
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For a low level AM system, the amplifiers modulated stage must be
A:
linear devices
B:
harmonic devices
C:
class C amplifiers
D:
non-linear devices
Answer: A
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Which of the following does not cause losses in optical fibre cables?
A:
Stepped index operation
B:
Impurities
C:
Microbending
D:
Attenuation in glass
Answer: A
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The frequency range of 300 kHz to 3000 kHz is known as
A:
low frequency
B:
medium frequency
C:
high frequency
D:
very high frequency
Answer: B
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Consider a sampled signal y(t) = 5 x 10-6 x(t) where x(t) = 10 cos (8p x 103)t and ts = 100 μ sec. when y(t) is passed through an ideal low-pass filter with a cut off frequency of 5 kHz, the output of the filter is
A:
5 x 10-6 cos (8p x 103)t
B:
5 x 10-5 cos (8p x 103)t
C:
5 x 10-1 cos(8p x 103)t
D:
10 cos(8p x 103)t
Answer: B
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