Question

Which of the following techniques is utilized to determine at the actual point at which the root locus crosses the imaginary axis?

(a) Nyquist technique

(b) Routh-Hurwitz technique

(c) Nichol’s technique

(d) Bode technique

I had been asked this question by my school teacher while I was bunking the class.

My question is from Stability Analysis in portion Digital Control Systems of Control Systems

Answer 1

Right option is (b) Routh-Hurwitz technique

The best I can explain: Routh-Hurwitz technique is utilized to determine at the actual point at which the root locus crosses the imaginary axis.