Signals and Systems - Engineering

Q1:

Choose the function f(t), - ∞ < t < + ∞, for which a Fourier series cannot be defined

A 3 sin (25t)

B 4 cos (20t + 3) + 2 sin (10t)

C exp - | t | sin 25 t

D 1

ANS:C - exp - | t | sin 25 t

Fourier series is applicable for periodic or finite duration signal and (c) is neither periodic nor finite duration signal.