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In q(s) plane Nyquist plot is symmetrical about the :

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In q(s) plane Nyquist plot is symmetrical about the :

(a) Imaginary axis

(b) Real axis

(c) Origin

(d) None of the mentioned

I have been asked this question by my college professor while I was bunking the class.

My question comes from Closed-Loop Frequency Response in section Stability in Frequency Domain of Control Systems

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The correct answer is (b) Real axis

For explanation I would say: By definition, In q(s) plane Nyquist plot is symmetrical about the real axis.

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