# Electronics and Communication Engineering - Signals and Systems

### Exercise :: Signals and Systems - Section 8

1.

The discrete time system describes by y(n) = x(n2) is

 A. casual, Linear, time varying B. casual, non-linear, timevari C. non-casual, Linear, time invariant D. non-casual, non-linear, time variant

Answer: Option A

Explanation:

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2.

If Laplace transform of f(t) is F(s), then £[tf(t)] =

 A. B. C. D. Answer: Option B

Explanation:

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3.

A system is stable if ROC

 A. include the unit circle B. exclude the unit circle C. lies on Circle D. entire plane

Answer: Option A

Explanation:

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4.

The Laplace transform of a unit step function is

 A. 1 B. 1 / s C. s D. 1 / s2

Answer: Option B

Explanation:

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5.

The minimum sampling frequency in sample/sec. required to reconstruct the following signal from its samples wuthout distortion would be

 A. 2 x 103 B. 4 x 103 C. 6 x 103 D. 8 x 103

Answer: Option C

Explanation:

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