engineering recuitment BHEL Engineer Trainee Mock Test 2025 Signals and Systems Fourier Series

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

1

x(t) = 2 cos t + 3 cos 3t

2

x(t) = 2 cos πt + 7 cos t

3

x(t) = cos t + 0.5

4

x(t) = 2 cos 1.5 πt + sin 3.5πt

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