题目内容

In a diesel engine lube oil system, which of the following parts should be lubricated first?( )

A. Camshaft bearings.
B. Main bearings.
C. Piston crowns.
D. Cylinder walls.

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Lubricating systems for diesel engines are usually designed to initially provide lube oil to theengine( )

A. camshaft bearings
B. main bearings
C. piston crowns
D. cylinder walls

Oil is supplied to the cylinder liner wall and the piston rings by means of( ) giving a carefully controlled oil feed, through injectors or quills.

A. electric magnet valve
B. common rail system
C. mechanical lubricators
D. inductors

In some designs, cylinder oil supplying is timed so that the oil impinges only on( ) thus ensuring the most efficient lubrication.

A. the piston ring belt
B. the piston crown
C. the piston skirt
D. the piston

Steam generated by boilers may be used for driving the main engine when( ) are fitted.

A. diesel engines
B. gas engines
C. gas turbines
D. steam turbines