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Exam Questions Papers - Engineering

Q1:

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

A E

B E/2

C E/4

D 2E

ANS:B - E/2

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 = .