Control Systems
When writing a transfer function which of the following loops are not valid loops?

 Both 1 and 2.
 Neither 1 nor 2.
 Self loops at input node.
 Self loops at output node.

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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).
 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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