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How much does the delay change, if the step time is taken as two units in time, in r(t-m), in scope 1 and 3?

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How much does the delay change, if the step time is taken as two units in time, in r(t-m), in scope 1 and 3?

(a) 1 and 3

(b) 2 and 3

(c) 3 and 1

(d) Error

The question was posed to me in quiz.

The above asked question is from Z Transform in portion Digital Signal Processing of MATLAB

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The correct answer is (a) 1 and 3

Explanation: In scope 1, the input of the Transfer function block is u(t-2) and the step response leads to multiplication in z-domain which shows that the ramp output gets advanced by 1 unit and the result of scope1 is r(t-1). After going through Delay of z-2, the output is r(t-3).

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