A piston in a four-stroke/cycle diesel engine makes four strokes during each _____.A.crank

(piston area)×(piston stroke)×(numbers of the cylinders)=engine().

A.brake horsepower

B.displacement

C.cylinder volume

D.cylinder clearance

The function of the piston rings is to ________.

A help cool the piston by transferring heat from the piston to the cylinder wall

B provide a sliding seal between the piston and cylinder wall

C scrape oil off the cylinder wall as the piston moves down on the power and intake strokes.

D all of the above

A.活塞

B.生气

C.浴池

full-slipper piston 意思是(高速发动机)轻型活塞。()

______ makes the piston to move up and down in the engine cylinder.

A pressure changes

B piston head

C atmospheric pressure

D mechanical force

A.twice as large as with a cast iron piston

B.the same size as with a cast iron piston

C.half as large as with a cast iron piston

D.the same size as the crown of an aluminum piston

A.between, to

B.either, or

C.from, to

D.neither, nor

A.the same piston

B.the piston nearby

C.the other pistons

D.the generators on board

The function of the piston compression rings used in a diesel engine is to _________.

A.seal the space between the piston and liner

B.transmit heat from the piston to the cylinder liner

C.reduce the amount of combustion gas blow-by

D.all of the above

Cracking of a diesel piston crown can result from_______________.

A.Excessive piston to liner clearance

B.The underside of the piston crown being excessively dirty lowering the rate of heat transfer

C.Faulty nozzle spray

D.All of the above