Noise in Communication Systems – 1 – 1

1. Probability density function of thermal noise is –

(a) Binominal
(b) Gaussian
(c) Poisson
(d) None of the above

Answer
Answer : (b)

Explanation
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2. Spectral density of white noise –

(a) Varies with frequency
(b) In constant
(c) Varies with bandwidth
(d) None of the above

Answer
Answer : (b)

Explanation
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3.Which system is free from noise ?

(a) FM
(b) AM
(c) Both FM and AM
(d) None of the above

Answer
Answer : (a)

Explanation
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4. The noise performance of a square law demodulator of AM signal is :

(a) Poorer than that of an envelope detector
(b) Better than that of a synchronous detector
(c) Better than that of an envelope detector
(d) Identical with that of a synchronous

Answer
Answer : (b)

Explanation
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5. The noise performance of wide band FM system :

(a) Exhibits a threshold
(b) Is independent of modulation index
(c) Is generally poorer than that of an AM system
(d) Is independent of signal-to-noise ratio

Answer
Answer : (a)

Explanation
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