Question

P+D controller:

(a) Introduces offset

(b) Increases bandwidth

(c) Increases margin of stability

(d) Reduces velocity constant

I had been asked this question during an interview.

I'd like to ask this question from Cascade Compensation in Frequency Domain in section Design of Control Systems

Answer 1

Right answer is (c) Increases margin of stability

To explain: Proportional Derivative controller is the controller increases margin of stability and also used to increase he bandwidth and also increases the signal to noise ratio.