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Question

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).


Options:
A .  W = `1//sqrt(14),K_C= 45//7 sqrt(14)`
B .  W =` sqrt(7//6),K_C`= 46/3
C .  W = `1, K_C` = 13
D .  W = `sqrt(7//8),K _C `= 45/4
Answer: Option B


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