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


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1.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

2.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

3.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

4.單項(xiàng)選擇題Failure of the burner flame in an auxiliary boiler would probably be a result of()

A.water in the fuel oil
B.broken high tension leads
C.incorrect electrode setting
D.full fuel pressure at the nozzle

5.單項(xiàng)選擇題Which action should be taken when an auxiliary boiler in is operation?()

A.Clean all electrical connections
B.Lift the relief valves by hand
C.Inspect and clean all solenoid valves
D.Inspect for oil and water leaks