Control Systems
A function y (t) satisfies the following differential equation : Where, δ (t) is the delta function. Assuming zero initial condition and denoting the unit step function by u(t), y(t) can be formed as

 e-tu(t).
 e-t.
 etu(t).
 et.

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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) and Q (s) are same.
 the degree of P (s) is always greater than the degree of Q (s).
  degree of P (s) is independent of degree of Q (s).

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