Process Control and Instrumentation
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).

W = 1, Kc = 13
W = √(7/8), Kc = 45/4
W = √(7/6), Kc = 46/3
W = 1/√14, Kc = 45/7√14

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Process Control and Instrumentation
The characteristic equation for the control system with a closed loop transfer function G₁/1 + G₂ is given by 1 + G₂ = 0. The characteristic equation for the control system

Is the same for set point or load changes
Determines its stability
All of these
Depends only upon the open loop transfer function

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