Control Systems
Time response for a second order system depends on the value of τ. If τ= 0 then the system is called as

  under damped system.
  undamped system.
  critically damped system.
  over damped system.

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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

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

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