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The polar plot of a transfer function passes through the critical point (-1,0). Gain margin is

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The polar plot of a transfer function passes through the critical point (-1,0). Gain margin is

(a) Zero

(b) -1dB

(c) 1dB

(d) Infinity

I had been asked this question by my school teacher while I was bunking the class.

My question comes from Polar Plots in portion Frequency Response Analysis of Control Systems

1 Answer

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Best answer
Correct choice is (a) Zero

Best explanation: Gain margin of a polar plot passing through the critical point is zero.

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