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Automatic Control Systems - Engineering

Q1:

Consider the following statements:
The gain margin and phase margin of an unstable system may respectively be
  1. positive, positive
  2. positive, negative
  3. negative, positive
  4. negative, negative
Of these statements

A 1, 4 are correct

B 1 and 2 correct

C 1, 2, 3 are correct

D 2, 3, 4 are correct

ANS:D - 2, 3, 4 are correct

For stable system both must be positive.