Question

Benefits of feedback:

(a) Performance of system is greater.

(b) Need for system much larger path gain and system instability.

(c) Controlled variable accurately follows the desired value

(d) Affected by parameter variations

I got this question in an interview.

The origin of the question is Feedback and Non-feedback Systems topic in portion Feedback Characteristics of Control Systems of Control Systems

Answer 1

Correct answer is (d) Affected by parameter variations

The best explanation: Closed loop system is the system with the feedback and this can be positive or negative feedback and  having feedback have less dependence on parameter variation.