resist changes in viscosity with changes in temperature
resist emulsification
neutralize acids
resist oxidation at high temperatures
第1题：
contaminated with sludge
contaminated with carbon
diluted with fuel oil
diluted with water
第2题：
excessive crankcase pressure
excessive lube oil temperature
contamination of the lube oil by water
contamination of the cooling water by lube oil
第3题：
Oil oxidation as a result of excessively high lube oil temperature, is harmful to a diesel engine Because
A.oil foaming will always occur
B.large quantities of oil are consumed
C.lube oil viscosity is always decreased
D.corrosive by-products are usually formed
第4题：
lube oil pump suction line
lube oil pump discharge line
bottom of the lube oil sump
outlet from the lube oil header
第5题：
Dirty lube oil filter
Too much piston ring wear
High lube oil viscosity
Low lube oil temperature
第6题：
pitting
sludge
hard varnish
all of the above
第7题：
a dirty lube oil strainer
internal water leaks
an oil suction line restriction
excessive wears of the cooling water pump
第8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9题：
clogged lube oil piping
excessive valve-guide clearance
high lube oil viscosity
low lube oil temperature
第10题：
an increased flash point
higher lube oil pressures
an increased viscosity
lower lube oil pressures