The temperature of the water in a small outside storage tank is controlled by a set of heaters submerged in the tank.
The heaters energize at a water temperature of 40°F and deenergize at 48°F.
When energized, the heaters produce a constant thermal output.
Which one of the following types of control devices is used in the heater control circuit to produce these characteristics?
A. Bistable
B. Proportional
C. Proportional plus integral
D. Proportional plus derivative
Show Answer
Answer: A
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