A.decrease the velocity of gases flowing past the tubes
B.increase the rate of heat transfer
C.reduce accumulations carbon deposits
D.direct the flow of gases
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A.fuel oil supply temperature is normal
B.burner electrode is incorrectly positioned
C.fuel／air ratio is incorrect
D.ignition current is too low
A.when the boiler has been secured long enough for most solids to settle
B.when the boiler has been cooled to ambient temperature
C.only after raising the water level to within 0~5 inch of the high water cutout only
D.after bypassing the low pressure
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
A.defective solenoid valve
B.dirty fuel nozzle
C.grounded high tension lead
D.faulty ignition cable connector
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
最新試題
Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
The shipboard oil pollution emergency plan will be invalid after （）
Diesel engine air start system check valves are opened by （）
If separating effect is not good, which measure should be taken （）
（） is not installed on the main switchboar.
Using a file without a handle may result in （）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）