Q.

Which one of the following is not a ramp function?

A. r(t) = t when t ≥ 0
B. r(t) = 0 when t < 0
C. r(t) = ∫u(t)dt when t < 0
D. r(t) = du(t)⁄dt
Answer» D. r(t) = du(t)⁄dt
Explanation: ramp function r(t) = t when t ≥ 0 and r(t) = 0 when t < 0
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