Electronics and Communication Engineering - Communication Systems

26. 

If Vs is signal voltage, Vn is noise voltage, signal to noise ratio S/N is defined as

A.
B.
C.
D. none of the above

Answer: Option B

Explanation:

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27. 

The PDF of a Gaussian random variable X is given by . The probability of the event {X = 4} is

A.
B.
C. 0
D.

Answer: Option B

Explanation:

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28. 

Tuned voltage amplifiers are not used

A. in public address systems
B. in radio receivers
C. in television receivers for sound signals
D. in television receivers for video signals

Answer: Option A

Explanation:

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29. 

If B is the bandwidth, the thermal noise voltage is proportional to

A. B
B. B0.5
C. B1.5
D. B2

Answer: Option B

Explanation:

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30. 

ARQ stands for

A. Automatic Repeat Quest
B. Analog Repeat Request
C. Automatic Repeat Request
D. None Of the above

Answer: Option C

Explanation:

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