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

1.

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

Answer: Option C

Explanation:

x(t) = cos t + 0.5

not satisfies the Dirichlet condition.

The integration of constant term is ∞

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