单项选择题Heavy residual fuel oils are heated prior to centrifuging to ()

A.reduce fuel weight
B.increase specific gravity
C.separate fuel from lube oil
D.reduce fuel viscosity


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1.单项选择题In a diesel engine, blow-by is generally the result of worn()

A.valve guides
B.oil control rings
C.valve seats
D.compression rings

4.单项选择题In a four-cycle diesel engine piston blow-by can result in increased()

A.crankcase pressure
B.compression pressure
C.scavenge pressure
D.exhaust manifold pressure

5.单项选择题The most effective method in removing water from diesel fuel oil is by()

A.centrifuging the fuel
B.using it in the engine
C.heating the fuel tanks
D.starting the fuel

6.单项选择题On board supply vessels, a centrifuge is normally used to purify()

A.cooling water
B.fuel oil
C.sea water
D.diesel intake air

7.单项选择题Water accumulating in the crankcase of a diesel engine could indicate()

A.a cracked cylinder liner
B.excessive water in the fuel
C.a leaking intercooler
D.excessive moisture in the scavenge air

8.单项选择题The device used to store a charged pressure for a hydraulic starting system is called the()

A.reservoir
B.hand pump
C.accelerator
D.accumulator

9.单项选择题How dose water enter the crankcase of a diesel engine?()

A.Through the crankcase exhauster
B.As water vapor contained in blow-by
C.Demulsifying lube oil passing through the main bearings
D.Condensation from vapor formed in the expansion tank

10.单项选择题Standby or emergency diesel generator day tanks should always be kept full to reduce the possibility of()

A.sediment contamination
B.fuel filter clogging
C.moisture formation
D.inadequate transfer pump suction head