The main steam boiler control device used with an on/off combustion fuel control is a _____ sensing element.

The main steam boiler control device used with an on/off combustion fuel control is a _____ sensing element.

The main steam boiler control device used with an on/off combustion fuel control is a _____ sensing element.




a. Pressure
b. Level
c. Temperature
d. Flow
e. Pneumatic


Answer: a


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