Question

A conditionally stable system exhibits poor stability at :

(a) Low frequencies

(b) Reduced values of open loop gain

(c) Increased values of open loop gain

(d) High frequencies

I have been asked this question in exam.

This interesting question is from Parameter Optimization in portion Optimal Control Systems of Control Systems

Answer 1

Correct option is (b) Reduced values of open loop gain

The explanation is: A conditionally stable system is the system which is stable only for certain values of K and exhibits poor stability at the reduced values of open loop gain.