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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 |
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Answer» Correct option (D) The closed-loop system is unstable for sufficiently large and positive k Explanation: For larger values of K, it will encircle the critical point (-1+j0), which makes closed-loop system unstable. |
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