MCQ Practice Question

A continuous-time sinusoidal signal is periodic when its angular frequency is?

ANonzero; every single continuous-time sinusoid with fixed nonzero frequency is periodic
BAn integer only
CLess than 1 rad/s only
DExactly pi rad/s only

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Correct Answer: A. Nonzero; every single continuous-time sinusoid with fixed nonzero frequency is periodic

Explanation: A single continuous-time sinusoid cos(omega0 t+phi) with fixed nonzero omega0 has period 2pi/|omega0|.

Reference: Standard signals and systems: periodic signals