Control Systems
For a transfer function H (s) = P(s) / Q(s), where P (s) and Q (s) are polynomials in s. Then

  degree of P (s) is independent of degree of Q (s).
 maximum degree of P (s) and Q (s) differ at most by one.
 the degree of P (s) is always greater than the degree of Q (s).
 the degree of P (s) and Q (s) are same.

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Control Systems
Find the conditions for the system to be stable?

 Gain margin is positive but phase margin is negative
 Gain margin and phase margins are positive
 Gain margin is negative but phase margin is positive
 Gain margin and phase margins are negative

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