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Gain margin is:

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Gain margin is:

(a) It is a factor by which the system gain can be increased to drive it to the verge of instability

(b) It is calculated at gain cross over frequency

(c) It is calculated at phase cross over frequency

(d) Both a and c

I got this question in an interview.

I want to ask this question from Assessment of Relative Stability Using Nyquist Criterion topic in chapter Stability in Frequency Domain of Control Systems

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Right choice is (d) Both a and c

Explanation: Gain margin is a factor by which the system gain can be increased to drive it to the verge of instability and is calculated at phase cross over frequency.

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