单项选择题
The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）
A.in the event of a flame failure
B.in the event of a stack fire
C.when the water level reach the crown sheet
D.when the feed pump discharge pressure drops to a preset minimum
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相关考题
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单项选择题
Burner ignition failure in an automatically fired auxiliary boiler would be caused by（）
A.a burned out solenoid in the oil supply valve
B.high temperature excess air
C.incorrectly setting the hot-well dump valve
D.an incorrectly positioned burner snubber realy -
单项选择题
Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?（）
A.clean the flame scanner photocell window
B.Inspect and clean all solenoid valves
C.lift the safety valves by hand
D.Inspect for oil or water leaks -
单项选择题
When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?（）
A.cold fuel oil
B.low fuel oil pressure
C.low atomizing steam pressure
D.water in the fuel oil
