Automatic Control Systems - Engineering

Q1:

For a closed loop system
The imaginary axis intercept of the root loci will be

A ± j 2.8

B ± J 0.28

C ± j 1.14

D ± j 11.4

ANS:A - ± j 2.8

Actually it is taking a lot of time. So can it be solved faster without the routh table.