单项选择题
Bottom blow valves are installed on auxiliary water-tube boilers to （）
A.completely drain the boiler in an emergency
B.prevent sludge from forming in the drum
C.remove floating impurities from the boiler water surface
D.remove settled solids from the water drum
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相关考题
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单项选择题
A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）
A.defective solenoid valve
B.dirty fuel nozzle
C.grounded high tension lead
D.faulty ignition cable connector -
单项选择题
A firebox explosion in an automatically fired auxiliary boiler may be the result of （）
A.excessive purging before lighting off
B.insufficient trail for ignition period
C.a faulty transformer in the ignition circuit
D.insufficient purging before lighting off -
单项选择题
The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
A.prevent engine back pressure at heavy loads
B.increase total engine efficiency at low loads
C.prevent boiler corrosion at low engine loads
D.improve engine fuel consumption at any load
