The level in a tank is controlled by an automatic level controller.
Level is initially at 50 percent when the tank develops a leak.
When level decreases to 45 percent the level controller opens a makeup supply valve.
After a few minutes, level is 55 percent and the makeup valve closes.
With the leak still in progress, level continuously oscillates between 45 percent and 55 percent as the makeup valve opens and closes.
The controller in this system uses primarily __________ control.
A. bistable
B. proportional
C. integral
D. derivative
Show Answer
Answer: A
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