Question

Assertion (A): The closed loop stability can be determined from the poles of an open loop system and the polar plot of the frequency response.

Reason (R): Unstable system has right half poles.

(a) Both A and R are true and R is correct explanation of A

(b) Both A and R are true and R is not correct Explanation of A

(c) A is True and R is false

(d) A is False and R is true

The question was posed to me in quiz.

My enquiry is from Compensation Techniques in section Digital Control Systems of Control Systems

Answer 1

Right option is (b) Both A and R are true and R is not correct Explanation of A

To explain I would say: Closed loop system can be made stable if the poles of the closed loop system are all lying on the left half of the plane and this can be determined from the poles of an open loop system.