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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 18
41.
Which of the following oscillator is not in FM?
Crystal oscillator
Hartley oscillator
Colpitts oscillator
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
The number of spectral component of impulse wave is
1
0
2
∞
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.

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.

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.
44.
If M (jω) = £[m(t)] where £ denotes Fourier transform, then £[m(t) cos ωct] =
M (jω + jωc)
M (jω - jωc)
M (jω + jωc) + M (jω - jωc)
[M (jω + jωc) + M (jω - jωc)]
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
When a wave reaches the open circuited end of a line
all the forward energy is reflected by the open circuit
all the forward energy is absorbed by the open circuit
a small portion of energy is radiated into atmosphere and the remaining energy is reflected
either (a) or (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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