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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 21
6.
If there are M messages and each message has probability , the entropy is
0
1
log2 M
M log2 M
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Narrowband FM signal can be considered to be equal to
PM
AM
SSB
DSB
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
The spectral component of noise associated with kth frequency is given, in the limit as Δf → 0 by nk(t) written as nk(t) = Ck cos (2pk Δft + θk)
Consider the following statements as regards Ck and θk
  1. Ck and θk are independent of one another
  2. Ck and θk are independent of the amplitude of a spectral component at a different frequency
  3. Ct and θk are independent of the phase of a spectral component at a different frequency
Which of the above statements are correct?
1, 2 only
1, 3 only
1, 2, 3
2, 3 only
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
The power density spectrum of noise voltage at the input of a network is Sni and that at the output of the network is Sno. If transfer function of network is H(ω), the corresponding noise figure is
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
A narrowband amplifier is one that has a passband
limited to 2000 Hz only
limited to audio frequency range only
near cut off region of active device
approximately 10% of its central frequency
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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