# Electronics and Communication Engineering - Signals and Systems

### Exercise :: Signals and Systems - Section 6

1.

eAt can be expanded as

 A. B. C. D. Explanation:

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2.

If , f(t) =

 A. B. C. D. Explanation:

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3.

For a wave v = V 1m sin (ωt + θ1 ) - V3m sin (3ωt + θ3), the rms value is (0.5 V21m + 0.5 V23m)0.5

 A. True B. False

Explanation:

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4.

The function in the given figure can be written as A. u(t - 1) sin p ( t - 1) - u(t - 3) sin p (t - 3) + u(t - 4) sin p (t - 4) - u(t - 6) sin p (t - 6) B. u(t - 1) sin p ( t - 1) - u(t - 3) sin p (t - 3) + u(t - 4) sin p (t - 4) C. u(t - 1) sin p ( t - 1) + u(t - 4) sin p (t - 4) D. u(t - 1) sin 2p ( t - 1) + u(t - 4) sin 2p (t - 4)

Explanation:

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5.

F.T. of continuous non-periodic signal is

 A. aperiodic B. periodic C. a and b D. none