Question

Find the velocity error constant of the system given below :

(a) 0

(b) 2

(c) 4

(d) ∞

This question was addressed to me in an interview for internship.

My question is based upon Steady-state Errors and Error Constants in section Time Response Analysis, Design Specifications and Performance Indices of Control Systems

Answer 1

Correct choice is (c) 4

For explanation I would say: Comparing with the characteristic equation the values of G and w are calculated as G = 1 and w = 4 and hence the system is critically damped.