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Exam Questions Papers - Engineering

Q1:

The signal y(t) = x(- t) is __________ .

A causal

B non-causal

C depends on x(t)

D none of these

ANS:C - depends on x(t)

For signal x(- t) to be causal, the original signal x(t) has to be anticausal. Similarly for signal x(- t) to be non causal, the original signal x(t) has to be causal. Hence response of x(t) depends solely on x(t) only.