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Electronics and Communication Engineering - Automatic Control Systems - Discussion

Discussion Forum : Automatic Control Systems - Section 4 (Q.No. 37)
Automatic Control Systems
37.
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
1, 4 are correct
1 and 2 correct
1, 2, 3 are correct
2, 3, 4 are correct
Answer: Option
Explanation:

For stable system both must be positive.

Discussion:
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