transfer heat from the cylinder to the piston
scrape oil from the sides of the piston
seal the combustion space from the crankcases
prevent any piston contact with the cylinder liner
第1题：
decreased compression pressure
increased lube oil pressure
lower lube oil temperature
excessive leakage past the piston rings
第2题：
wide compression rings are used
oil rings are located above the piston
chromium plating is used on all piston rings
oil rings are located near the bottom of the piston skirt
第3题：
Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?
A.Control the amount of lube oil burned in the combustion chamber
B.Transmit heat from the piston to the cylinder liner
C.Prevent damage to ring groove inserts by acting as a heat dam
D.Dissipate combustion chamber gas pressure by channeling it through the ring gap
第4题：
residual carbon deposits
lube oil viscosity breakdown
uneven heat expansion of the rings
uneven heat expansion of the piston
第5题：
Ⅰonly
Ⅱ only
both Ⅰ and Ⅱ
neither Ⅰ nor Ⅱ
第6题：
prevent any lubricant from reaching
prevent excessive lubrication from reaching the combustion space
Provide metal-to-metal contact to seal the cylinder against blow-by
assure a positive means of scraping carbon accumulation from the cylinder
第7题：
starting the engine while hot
knurling the piston skirt
operating the engine overheated
scuff resistant piston rings
第8题：
clogged coolant passages
a leaking cylinder head gasket
low fuel oil pressure
worn or broken cylinder liner sealing rings
第9题：
low compression pressure
increased piston wear
increased cylinder lube oil consumption
poor contact between compression rings and liner
第10题：
Shape of the piston crowns
Increasing the compression ratios
Increasing the piston crowns
Increasing the turbocharger gear ratio