The water level in a tank is being controlled by an automatic level controller and is initially at the controller setpoint.
A drain valve is then opened, causing tank level to decrease.
The decreasing level causes the controller to begin to open a makeup water supply valve.
After a few minutes, a new steady-state tank level below the original level is established, with the supply rate equal to the drain rate.
The controller in this system uses __________ control.
A. proportional, integral, and derivative
B. proportional and integral only
C. proportional only
D. bistable
Show Answer
Answer: C
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