Exam Questions Paper - ECE Questions and Answers

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If a signal f(t) has energy E, the energy of the signal f(2t) is equal to __________ .

E/2

E/4

Answer : Option B

Explanation :

Energy content of a signal x(t), E = |f(t)|² dt

Now, E^' = |f(2t)|² dz for signal f(2t)

Putting 2t = z, we get

E^' = |f(t)|² dz = .

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