Refer to the drawing of a lube oil temperature control system (see figure below).
The temperature controller is a direct-acting proportional-integral controller with a gain of 1.0.
A step increase in lube oil temperature results in an initial controller demand for the temperature control valve (TCV) to open an additional 10 percent.
After the lube oil temperature stabilizes, the final TCV position is 60 percent open.
If the controller’s gain was 2.0 rather than 1.0, the initial controller demand for the above temperature transient would be for the TCV to open an additional __________ percent; and the final TCV position would be __________ percent open.
A. 5; 60
B. 5; less than 60
C. 20; 60
D. 20; more than 60
Show Answer
Answer: C
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