The level in a drain collection tank is being controlled by an automatic level controller and is initially stable at the controller setpoint.
Flow rate into the tank increases, causing tank level to increase.
The increasing level causes the controller to throttle open a tank drain valve.
After a few minutes, a new stable tank level above the original level is established, with the drain flow rate equal to the supply flow rate.
The controller in this system uses __________ control.
A. on-off
B. proportional
C. proportional plus integral
D. proportional plus integral plus derivative
Show Answer
Answer: B
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