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Question: q4 a unity negative feedback closed loop control system with...

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Q4. A unity negative feedback closed loop control system, with a proportional controller, has an open-loop transfer function of: (s + 2) s(s-1 (a) Evaluate G(ja) for 0 5 rads/sec. ω [10 Marks] (b) Sketch the Nyquist diagram of the open loop system. 6 Marks] (c) From the sketch of the Nyquist diagram in part (b). or otherwise, 2 Marks] 12 Marks] determine (i) The range of Kc for which the closed loop system is stable. (ii) The value of Kc that yields a phase margin of 450

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