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The Nyquist plot of a loop transfer function G(jω) H(jω) of a system encloses the (-1, j0) point. The gain margin of the system is
1. less than zero
2. zero
3. greater than zero
4. infinity

1 Answer

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Best answer
Correct Answer - Option 1 : less than zero

The Nyquist plot of a loop transfer function G(jω) H(jω) of a system encloses the (-1, j0) point.

That means the given system is unstable, hence the gain margin is negative.

Important Points:

  • For a stable system, gain margin and phase margin are positive
  • For an unstable system, gain margin and phase margin are negative
  • For a marginally stable system, gain margin and phase margin are equal to zero.

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