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

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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
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单项选择题

The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）

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The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler （）

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D.burner flame is extinguished