When Td 0, the PD controller reduces to a proportional controller, Gc1s2 K In this case, use the Nyquist plot to determine the limiting value of K for closed loop stability a K 0 5 b K 1 6 c K 2 4 d K 4 3 For Problems 8 and 9, consider the block diagram in Figure 9 69 where G(s) 9 (s 1)(s 3s 9)' and the controller is the proportional plus derivative (PD) controller Ge(s) K(1 Tas)

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When Td   0, the PD controller reduces to a proportional controller, Gc1s2   K  In this case, use the Nyquist plot to determine the limiting value of K for closed loop stability  a  K   0 5 b  K   1 6 c  K   2 4 d  K   4 3 For Problems 8 and 9, consider the block diagram in Figure 9 69 where G(s) 9 (s 1)(s 3s  9)' and the controller is the proportional plus derivative (PD) controller Ge(s)   K(1 Tas)

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Question: When Td = 0, the PD controller reduces to a proportional controller, Gc1s2 = K. In this case, use the Nyquist plot to determine the

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