ISRO Electrical Engineering (EE) 2017 - Question 47

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If the gain of an open loop system is doubled, the gain margin

  • A. Is not affected
  • B. Gets double
  • C. Becomes half
  • D. Becomes one-fourth

Answer: C. Becomes half

Explanation: Gain margin GM = 1/|G(jωpc)|. If open-loop gain is doubled, |G(jωpc)| doubles, so the gain margin becomes half.

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