excessive ring action
excessive ring temperature
improper ring rotation
excessive ring face wear
第1题：
The oil control rings will seal improperly and wear rapidly
The piston will overheat due to insufficient lubrication
Excessive oil will remain on the cylinder wall
Light brown smoke will emanate from the engine exhaust
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：
decreased compression pressure
increased lube oil pressure
lower lube oil temperature
excessive leakage past the piston rings
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