Question

In a transfer function, the degree of numerator polynomial is ___________ than the degree of the denominator polynomial.

(a) greater than

(b) less than

(c) equal to

(d) less than or equal to

I have been asked this question in an interview.

My question comes from Properties of Transfer Functions in section S-Domain Analysis of Network Theory

Answer 1

Correct choice is (d) less than or equal to

For explanation I would say: In a transfer function, the degree of numerator polynomial is less than or equal to than the degree of the denominator polynomial. And the degree of the numerator polynomial of Z21(s) or Y21(s) is less than or equal to the degree of the denominator polynomial plus one.