Question

The real parts of all poles and zeros in a driving point function must be?

(a) zero

(b) negative

(c) zero or negative

(d) positive

This question was posed to me during an online exam.

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

Answer 1

Right choice is (c) zero or negative

Easiest explanation: The real parts of all poles and zeros in a driving point function must be zero or negative but should not be positive and the complex or imaginary poles and zeros must occur in conjugate pairs.