Question

Feedback control systems are:

(a) Insensitive to both forward and feedback path parameter changes

(b) Less sensitive to feedback path parameter changes than to forward path parameter changes

(c) Less sensitive to forward path parameter changes that to feedback path parameter changes

(d) Equally sensitive to forward feedback path parameter changes

I had been asked this question in an internship interview.

This intriguing question originated from Feedback and Non-feedback Systems topic in section Feedback Characteristics of Control Systems of Control Systems

Answer 1

Correct option is (c) Less sensitive to forward path parameter changes that to feedback path parameter changes

The best explanation: Feedback control system can be positive and negative but positive feedback systems less widely used as the positive feedback systems are more sensitive to parameter variations but negative feedback are less sensitive to change in G than change in H.