Question

What is the need for a controller?

(a) Receive control signals

(b) Transmit control signals

(c) Modify control signals

(d) Create control signals

I had been asked this question during an internship interview.

My question is based upon Integral Square Error & its Minimization in section Error Analysis of Control Systems

Answer 1

Right answer is (c) Modify control signals

Explanation: Controller is needed to modify control signals for better control action. Some control signals are raw signals which can’t function properly so we use controllers for modifying them.