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Question

A process exhibits oscillations for a critical gain setting of 10 in a time period of 30 minute. The setting of ziegler-Nichols for P+I controller mode respectively are:

A
kp=4.5,Ti=25 min
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B
kp=6,Ti=25 min
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C
kp=5,Ti=25 min
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D
kp=6,Ti=15 min
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Solution

The correct option is A kp=4.5,Ti=25 min
For P+I mode

kp=0.45 kc

kP=0.45×10=4.5

Ti=TC1.2=301.2=25 min

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