excessive lube oil consumption
lower than normal lube oil temperature
higher than normal exhaust back pressure
excessive crankshaft end play
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：
In a diesel engine, when refitting piston rings you should ①check the ring gap at the smallest diameter of the cylinder ②remove carbon from the ring groove
A.①
B.②
C.①②
D.neither ① nor ②
第4题：
low compression pressure
increased piston wear
increased cylinder lube oil consumption
poor contact between compression rings and liner
第5题：
Ⅰ only
Ⅱ only
both Ⅰ and Ⅱ
neither Ⅰ nor Ⅱ
第6题：
jam in the most worn part of the cylinder when the rings expand
break in the most worn part of the cylinder when the rings expand
wear eccentrically on the side opposite the end gap
overheat and jam at the top center on the combustion stroke
第7题：
Dirty lube oil filter
Too much piston ring wear
High lube oil viscosity
Low lube oil temperature
第8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9题：
Ⅰonly
Ⅱ only
both Ⅰ and Ⅱ
neither Ⅰ nor Ⅱ
第10题：
chromium plating piston rings
knurling the piston skirt
extended maximum power operation
applying load to a cold diesel engine