The function of lubricating oil is to( )
A. maintain even distribution of bearing wear
B. maintain a constant oil temperature
C. maintain a pressurized fluid film between moving surfaces
D. remove entrained water
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The lube oil pump used in a diesel engine is a( ) usually.
A. volute pump
B. centrifugal pump
C. diaphragm pump
D. gear pump
In an auxiliary diesel engine, the reason for knurling ( 压花纹) the piston skirt is to( )
A. improve skirt lubrication
B. allow for expansion
C. transmit forces evenly
D. improve the piston seal
Crank chamber oils must have good lubricating properties and be able to resist rupture of the film separating the moving parts in order to( )
A. ensure minimum lubrication
B. ensure minimum friction losses
C. ensure proper cooling
D. keep touch with each other
Large,slow speed, two-stroke marine diesel engines offer the advantages of the following except( )
A. burning poorer quality,cheaper fuel
B. providing large power
C. being reversible
D. using less oil than medium speed engines
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