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单选题
Two main lubricating oil pumps are usual and are obligatory in （）.
A
container ships
B
bulk carriers
C
passenger ships
D
barges
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单选题On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.A
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单选题In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.A
the fuel oilB
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单选题Under normal conditions, the main source of crankcase oil contamination is attributed to （）A
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单选题The oil pressure and flow from each bearings can be checked when（）A
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The use of engine driven pre-lube pumps is permitted on vessels with propulsion systems developing less than 500 shaft horsepowerC
When forced lubrication is used for propulsion engines, one independently driven stand-by pumps is to be provided in addition to the necessary pumps for normal operationD
Lubrication systems where two oil coolers are fitted require a minimum of two temperature control devices which may be actuated by similar sensors
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单选题Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.A
two fuel oil transfer pumps provided where one is to be independent of the main engineB
two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engineC
engine driven transfer pumps and only used in constant speed applicationsD
the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
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单选题There should be a lubricating oil （） between the main beatings and the crankshaft.A
filmB
capC
lacquerD
shell
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