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chemical engineering process control and instrumentation
1. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).
(A): w = 1, Kc = 13
(B): w = 1/14 , Kc = 45/714
(C): w = 7/6 , Kc = 46/3
(D): w = 7/8 , Kc = 45/4
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