Electronics and Communication Engineering - Signals and Systems

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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