單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)選擇題Which of the following procedures decreases the total dissolved solids concentration in the water of an auxiliary boiler?（）

A.Hydrazine treatment of condensate
B.Frequent compounding
C.Chemical cleaning
D.Bottom blowing