Question 3 Each of the following systems is feedback controlled with a proportional controller. Find the range of values of the proportional gain, Kc, that produce stable (if it is possible) closed-loop responses. Also, identify the characteristic equation for each case. Assume that Gm Gf 1 and (a) G, (6)-10 2s2 +3s-4 [7 marks] (b) Gp(s) = 0.1s+1 (7 marks] (c) G,(6)- 10 パ 2s-1 [6 marks]

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