# Electronics and Communication Engineering - Signals and Systems

### Exercise :: Signals and Systems - Section 5

1.

The unit step response of a system starting from rest is given by c(t) = 1 - e-2t for t ≥ 0. The transfer function of the syste is

 A. B. C. D. Explanation:

No answer description available for this question. Let us discuss.

2.

check the following system for causality

1. y[n] = x[n] + 2x[n - 1]
2. y[n] = x[n - k]
3. y[n] = x[2n]

 A. (1) and (2) B. (2) and (3) C. (1) omly D. (1) and (3)

Explanation:

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3.

If the system transfer function of a discrete time system then system is

 A. stable B. unstable C. stable at z = 1 D. unstable at z = 1

Explanation:

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4.

Two rectangular waveforms of duration t1 and t2 seconds are convolved. What is the shape of the resulting waveform?

 A. Triangular B. Rectangular C. Trapezoidal D. Semi-circular

Explanation:

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5.

The function Ae(s + jω)t represens a rotating phasor having a magnitude increasing with time.

 A. True B. False