Question

For a unity feedback control system, the open loop transfer function G(s) = 10(s+2)/s^2(s+1). What is the acceleration error constant?

(a) Infinity

(b) 5

(c) 10

(d) 20

I have been asked this question in an online interview.

My doubt stems from Integral Square Error & its Minimization topic in portion Error Analysis of Control Systems

Answer 1

The correct option is (d) 20

The best explanation: As limit s tends to zero s^2 G(s) H(s) = s^2 G(s) = 10*2/1 = 20. Therefore we get the value of Ka as 20 and both kv and ks are infinity.