carbonization of oils from the combustion chambers
emulsions of lube oil and water
coagulation of unburned fuel below the piston rings
all of the above
第1题：
lube cooler failure
poor heat transfer
mechanical lubricator failure
camshaft seizure
第2题：
a dirty lube oil strainer
internal water leaks
an oil suction line restriction
excessive wears of the cooling water pump
第3题：
In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .
A.all of the oil used by the engine through a filter
B.some of the oil used by the engine through a filter
C.some of the oil used by the engine through a centrifuge
D.all of the oil used by the engine through a centrifuge
第4题：
Camshaft beatings
Main bearings
Piston crowns
Cylinder walls
第5题：
clogged lube oil piping
excessive valve-guide clearance
high lube oil viscosity
low lube oil temperature
第6题：
pitting
sludge
hard varnish
all of the above
第7题：
Dirty lube oil filter
Too much piston ring wear
High lube oil viscosity
Low lube oil temperature
第8题：
Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.
A.increase power output
B.decrease lube oil viscosity
C.eliminate fuel knock
D.cause sulfuric acid formation
第9题：
lube oil pump suction line
lube oil pump discharge line
bottom of the lube oil sump
outlet from the lube oil header
第10题：
an increased flash point
higher lube oil pressures
an increased viscosity
lower lube oil pressures