1.

The frequency at which the Nyquist plot of a unity feedback system with the open loop transfer function \(G(s) = \frac {25s}{\sqrt {(s+1)}(s+1)^4}\) crosses the negative real axis is

A. 1 rad / s
B. √2 rad / s
C. √3 rad / s
D. 5 rad / s
Answer» D. 5 rad / s


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