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Overheating of boiler heating surfaces due to low water:
1) Cannot occur if the boiler is a hot water unit
2) Will cause a furnace explosion
3) Can be prevented with proper water treatment
4) Is the main cause of boiler failure
5) Can be eliminated with a low water fuel cutoff
The main controlling device used with an On/Off combustion fuel control is a _____ sensing element.
1) Pressure
2) Electronic
3) Temperature
4) Level
5) Pneumatic
Modulating pressure controller output:
1) Will shut down and start up the burner
2) Will control the temperature of the furnace
3) Will control the boiler output
4) Will vary the fuel and air flow to the boiler
5) Can be used on small boilers only
The low water cutoff can be tested by:
1) Shutting off the feed water
2) Opening the safety valve
3) Raising steam pressure
4) Shutting off the fire
5) Closing the steam discharge valve
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