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I got A,B,C done can you do D,E,F
Also can you check my solutions please. Thank you ?
Question 1 - Consider an unit feedback system whose open-loop transfer function is G(s)-k/ ((s + 1)(s 2 +4s 25)) A. Draw Bode plot of the open-loop system for k-75 B. Calculate the phase and magnitude of G(s) at 1 rad/s for k 75 C. Determine the cross-over frequency, and the phase and gain margins for k-75 (14 marks D. What is the required value of k to achieve a phase margin of 90° ? E. Based on the Bode diagram, sketch the Nyquist plot of the closed-loop system for k-1. Specify the points where the Nyquist plot crosses the real axis F. Based on the Nyquist stability criterion, determine the maximum value of k before instability G. If k is set higher than the maximum value determined in (F), determine the number of unstable roots of the closed- loop system. Confirm your answer with an approximate sketch of the root-locus
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