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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 25
16.
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
5 x 10-6 cos (8p x 103)t
5 x 10-5 cos (8p x 103)t
5 x 10-1 cos(8p x 103)t
10 cos(8p x 103)t
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The frequency range of 300 kHz to 3000 kHz is known as
low frequency
medium frequency
high frequency
very high frequency
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Which of the following does not cause losses in optical fibre cables?
Stepped index operation
Impurities
Microbending
Attenuation in glass
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
For a low level AM system, the amplifiers modulated stage must be
linear devices
harmonic devices
class C amplifiers
non-linear devices
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.

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.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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