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單項選擇題

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

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單項選擇題

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

單項選擇題

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

A.steam demand is high
B.salinity is high
C.safety valve simmers
D.burner flame is extinguished