單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題The amount of chloride content in the water of an auxiliary boiler can be reduced by（）

A.adding hydrazine
B.blowing down the boiler
C.adding phenolphthalein
D.adding a sulfite chloride scavenger

4.單項選擇題The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）

A.increase exhaust gas velocity through the boiler
B.reduce accumulations of carbon deposits on the heat transfer surfaces
C.eliminate exhaust gas pulsations and noise
D.increase the rate of heat transfer to the waterside

5.單項選擇題The water in an auxiliary boiler should be chemically tested daily for alkalinity and（）

A.soap hardness
B.nitrog encontent
C.chloride content
D.dissolved CO2