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Communication Systems - Engineering

Q1:

Which of the following cannot be the Fourier series expansion of a periodic signal?

A x(t) = 2 cos t + 3 cos 3t

B x(t) = 2 cos pt + 7 cos t

C x(t) = cos t + 0.5

D x(t) = 2 cos 1.5pt + sin 3.5 pt

ANS:C - x(t) = cos t + 0.5

x(t) = cos t + 0.5 not satisfies the Dirichlet condition. The integration of constant term is ∞.