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What is the impulse response of a system whose transfer function is that of pulse function?

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What is the impulse response of a system whose transfer function is that of pulse function?

(a) u(t)+u(t-4)

(b) u(t)-u(t-3)

(c) u(t)-u(t-4)

(d) u(t)-u(t+4)

This question was posed to me in examination.

The doubt is from Impulse Response in portion Control System Applications of MATLAB

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Correct answer is (c) u(t)-u(t-4)

The explanation: The inverse laplace transform of the transfer function gives the impulse response of a system. Now, the pulse shown in the above figure exists from t=0 to t=4 in time. The correct representation of the pulse is given by option u(t)-u(t-3) only.

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