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.
The tank suddenly develops a constant 200 gpm leak, while the input flow rate remains constant at 500 gpm.
When tank water level stabilizes, level will be __________; and the drain valve position will be __________.
A. 50 percent; more open
B. 50 percent; more closed
C. lower than 50 percent; more open
D. lower than 50 percent; more closed
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.