Refer to the drawing of a water storage tank with a level control system (see figure below).
The tank water level is being automatically controlled at 50 percent by a proportional-integral (PI) controller that positions the drain valve.
Tank water level is currently stable with 500 gpm entering the tank and the drain valve is 50 percent open.
Tank inlet flow rate suddenly increases to 700 gpm and remains constant.
When tank water level stabilizes, level will be __________; and the drain valve position will be __________.
A. higher than 50 percent; more open
B. higher than 50 percent; the same
C. 50 percent; more open
D. 50 percent; the same
Show Answer
Answer: C
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