Question

Consider the following statements regarding root loci:

(a) All root loci start from the respective poles of G(s) H(s)

(b) All root loci end at the respective zeros of G(s) H(s) or go to infinity

(c) The root loci are symmetrical about the imaginary axis of the s-plane

(d) All root loci start and end from the respective poles of G(s) H(s) or go to infinity

I got this question during an interview.

I'd like to ask this question from The Root Locus Concepts in chapter The Root Locus Technique of Control Systems

Answer 1

The correct answer is (b) All root loci end at the respective zeros of G(s) H(s) or go to infinity

To elaborate: All the root locus start at respective poles and end at zeroes.