prevent piston side thrust
prevent engine friction losses
transmit heat from the piston to the cylinder liner
remove oil from the cylinder combustion space
第1题：
decreased compression pressure
increased lube oil pressure
lower lube oil temperature
excessive leakage past the piston rings
第2题：
starting the engine while hot
knurling the piston skirt
operating the engine overheated
scuff resistant piston rings
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：
Shape of the piston crowns
Increasing the compression ratios
Increasing the piston crowns
Increasing the turbocharger gear ratio
第5题：
low compression pressure
increased piston wear
increased cylinder lube oil consumption
poor contact between compression rings and liner
第6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7题：
Ⅰonly
Ⅱ only
both Ⅰ and Ⅱ
neither Ⅰ nor Ⅱ
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：
residual carbon deposits
lube oil viscosity breakdown
uneven heat expansion of the rings
uneven heat expansion of the piston
第10题：
Control the amount of lube oil burned in the combustion chamber
Transmit heat from the piston to the cylinder liner
Prevent damage to ring groove inserts by acting as a heat dam
Dissipate combustion chamber gas pressure by channeling it through the ring gap