Question

The signal power of the periodic rectangular pulses of height 1 and width 1, is _______________

(a) 0.25 W

(b) 0.75 W

(c) 0.5 W

(d) 1 W

I have been asked this question during an online interview.

The origin of the question is Average Power and Energy of a Signal topic in section Fourier Series of Signals and Systems

Answer 1

The correct option is (c) 0.5 W

Best explanation: The signal power in the given signal using Parsevals’s relation is

\(P = \frac{1}{t} \int_0^T x^2 (t) \,dt\)

\(= \frac{1}{2} \int_0^1 1.dt\)

= 0.5 W.