Signals and Systems - ECE Questions and Answers

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If then system is

casual

uncasual

casual at z = 0.4, 2

uncasual at z = 0.4, z = 2

Answer : Option A

Explanation :

ROC will be |z| > 0.4 and |z| > 2

Hence ROC ⇒ |z| > 0.4, which is exterior of circle of radius 0.4

Hence causal if ROC is |z| > 0.4 then non-causal.

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