Q. 21 Consider the feedback system shown in the figure. The Nyquist plot of G(s) is also shown. Which one of the following conclusions is correct ?
(A) G(s) is an all pass filter
(B) G(s) is a strictly proper transfer function
(C) G(s) is a stable and minimum phase transfer function
(D) The closed-loop system is unstable for sufficiently large and positive k
Answer: D
Explanation:
