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In a feedback control system, phase margin(PM) is 1. Directly proportional to G 2. Inversely proportional to G 3. Independent of G 4. Zero when G =0 Which of the above statements are correct?

In a feedback control system, phase margin(PM) is 1. Directly proportional to G 2. Inversely proportional to G 3. Independent of G 4. Zero when G =0 Which of the above statements are correct? Correct Answer 1 and 4

For small values of G, PM is directly proportional to G and at G=0. phase margin(PM)=0.

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