单项选择题
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
When lighting off an auxiliary boiler, which of the pro...
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
The amount of chloride content in the water of an auxil...
单项选择题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
The purpose of designing some waste heat boilers with s...
单项选择题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
