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Scientist Nyquist have contribution in:

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Scientist Nyquist have contribution in:

(a) Asymptotic plots

(b) Polar plots

(c) Root locus technique

(d) Constant M and n circle

I got this question in an interview.

I need to ask this question from Frequency Response in section Frequency Response Analysis of Control Systems

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Correct answer is (b) Polar plots

The best I can explain: Nyquist plot is used to find the stability of the system by open loop poles and zeroes and the encirclements of the poles and zeroes and satisfying the equation N=P-Z and this is named under the name of scientist Nyquist.

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