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
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）
By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
Under MARPOL Code the ship to which it applies has to carry （）
The main purpose of port State control is not to（）
Engine parameters shall be corresponded to NOx Technical Files. This is required by （）
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
Diesel engine air start system check valves are opened by （）