1.

Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function G p ( s ) = 1/(4 s + 1)(2 s + 1)( s + 1).

A. w = 1/ 14 , K c = 45/7 14
B. w = 7/6 , K c = 46/3
C. w = 1, K c = 13
D. w = 7/8 , K c = 45/4
Answer» C. w = 1, K c = 13


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