题目内容
（请给出正确答案）
A piston is said to be at top dead center when it is ______.
A.opening the exhaust ports
B.placed on top of the engine along its centerline
C.farthest from the cylinder head
D.nearest to the cylinder head
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更多“A piston is said to be at top …”相关的问题
A.camshaft
B.crankshaft
C.piston
D.flywheel
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
______ 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.between, to
B.either, or
C.from, to
D.neither, nor
A.a exhaust valve
B.a piston skirt
C.a piston crown
D.an air suction valve
In an auxiliary diesel engine, the reason for knurling the piston skirt is to_____.
A.improve skirt lubrication
B.allow for expansion
C.transmit forces evenly
D.improve the piston seal
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
The lower section of a piston is called the ______.
A.land
B.skirt
C.crown
D.plate
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