Question

The use of feedback element in the feedback loop is:

(a) It converts the output variable ‘c’ to another suitable feedback variable ‘b’ to compare with the input command signal.

(b) It is the actuating element

(c) To increase the stability

(d) None of the mentioned

I have been asked this question by my college director while I was bunking the class.

Question is from Linear Approximation of the Non-Linear System topic in chapter Control System and Components of Control Systems

Answer 1

Correct choice is (a) It converts the output variable ‘c’ to another suitable feedback variable ‘b’ to compare with the input command signal.

The explanation is: The feedback can be positive and negative and so applied is to produce the error signal so as to get the desired output.