Question

Determine the sensitivity of the overall transfer function for the system shown in the figure below, at w=1 rad/sec with respect to the feedback path transfer function.

(a) 1.11

(b) -1.11

(c) 2.22

(d) -2.22

This question was posed to me in an internship interview.

This question is from Feedback Compensation in section Design of Control Systems

Answer 1

Right choice is (b) -1.11

The best explanation: S= -G(s)H(s)/1+G(s)H(s)-1.1.