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 by a proportional-only controller with a setpoint of 50 percent.
Tank water level is currently stable at 50 percent with 500 gpm entering the tank and the drain valve is 50 percent open.
The tank suddenly develops a 200 gpm leak, while the input flow rate remains constant at 500 gpm.
After the tank water level stabilizes, level will be __________; and the drain valve position will be __________.
A. 50 percent; more than 50 percent open
B. 50 percent; less than 50 percent open
C. below 50 percent; more than 50 percent open
D. below 50 percent; less than 50 percent open
Show Answer
Answer: D
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