Control Systems
A unity feed back system has forward transfer function The range of k for the system to be stable is

 0 < k < 390.
 0 < k < 3900.
 0 < k < 39.
None of these

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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).
 the degree of P (s) and Q (s) are same.
 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).

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