A unity feedback system has the open-loop transfer function G(s) = 1(s 1)(s + 2)(s + 3)The Nyquist plot of G(s) encircles the origin

A unity feedback system has the open-loop transfer function G(s) = 1(s

1.	A unity feedback system has the open-loop transfer function G(s) = 1(s 1)(s + 2)(s + 3)The Nyquist plot of G(s) encircles the origin
A.	never
B.	once
C.	twice
D.	thrice
Answer» C. twice

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A unity feedback system has the open-loop transfer function G(s) = 1(s 1)(s + 2)(s + 3)The Nyquist plot of G(s) encircles the origin

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