Electrical Engineering > Gate 2019 > Stability Analysis
The symbols, a and T, represent positive quantities and u(t) is the unit step function. Which one of the following impulse responses is NOT the output of a causal linear time-invariant system?
A
a+atu(t)
B
a-a(t+T)u(t)
C
a-a(t-T)u(t)
D
1+a-atu(t)

Correct : a

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