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chemical engineering process control and instrumentation
1. For a feed back control system to be stable, the
(A): Bode plots of the corresponding open loop transfer function should monotoni-cally decrease.
(B): poles of the closed loop transfer function should lie in the left half of the complex plane.
(C): poles of the closed loop transfer function should lie in the right half of the complex plane.
(D): roots of the characteristic equation should be real.
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