Control Systems
An open loop control system, represented by the transfer function G ( s ) = ( s - 1 ) / ( s + 2 )( s + 3 ), is

  unstable and of the minimum phase type.
  stable and of the non-minimum phase type.
  unstable and of the non minimum phase type .
  stable and of the minimum phase type.

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Control Systems
A cascade of three linear time invariant systems is causal and unstable. From this we conclude that

 the majority are unstable and the majority are causal.
 each system in the cascade is individually caused and unstable.
 at least one system is unstable and at least one system is causal.
 at least one system is causal and all systems are unstable.

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

 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.
  degree of P (s) is independent of degree of Q (s).

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