Automatic Control Systems - Engineering

Q1:

The open loop transfer function of a unity feedback system is The poles of closed loop system are at

A -2, -2

B -2, -1

C - 2, ± j 1

D - 2, 2

ANS:C - - 2, ± j 1

for s2 + 4s + 5 = 0, the roots are - 2 ± j1.