Question

Phase lag controller:

(a) Improvement in transient response

(b) Reduction in steady state error

(c) Reduction is settling time

(d) Increase in damping constant

I had been asked this question in examination.

This is a very interesting question from Tuning of PID Controllers topic in chapter Design of Control Systems

Answer 1

The correct choice is (b) Reduction in steady state error

To elaborate: Phase lag controller is the integral controller that creates the phase lag and does not affect the value of the damping factor and that tries to reduce the steady state error.