Control Systems
The output of the system has an effect upon the input quantity, then the system is a

 closed loop control system.
 open loop control system.
None of these
 either 1 or 2.

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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

  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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