Refer to the drawing of four bistable symbols (see figure below).
A temperature controller uses a bistable that turns on to actuate a warning light when the controlled temperature reaches a high setpoint.
The bistable turns off to extinguish the warning light when the temperature decreases to 5°F below the high setpoint.
Which one of the following bistable symbols indicates the characteristics of the bistable?
A. 1.
B. 2.
C. 3.
D. 4.
Show Answer
Answer: D
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