Consider a control system with unity feedback as in Figure 9 69 with loop transfer function (s 4) L(s) Ge(s)G(s) s(s 1)(s 5) The gain and phase margin are a G M dB, P M 58 1 b G M 20 4 dB, P M 47 3 c G M 6 6 dB, P M 60 4 d Closed loop system is unstable

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Consider a control system with unity feedback as in Figure 9 69 with loop transfer function (s   4) L(s)   Ge(s)G(s) s(s   1)(s  5)  The gain and phase margin are  a  G M  dB, P M    58 1 b  G M    20 4 dB, P M    47 3 c  G M    6 6 dB, P M    60 4 d  Closed loop system is unstable

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Question: Consider a control system with unity feedback as in Figure 9.69 with loop transfer function (s + 4) L(s) = Ge(s)G(s) s(s + 1)(s +5)*

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