Q.

When two LTI systems with impulse responses ha (t) and hb (t) are cascaded then equivalent response is given by              

A. h(t) = ha(t) + hb(t)
B. h(t) = ha(t) – hb(t)
C. h(t) = ha(t) hb(t)
D. h(t) = ha(t) * hb(t)
Answer» D. h(t) = ha(t) * hb(t)
Explanation: the equivalent impulse response of two systems connected in series (cascaded) is given by convolution of individual impulse responses.
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