determine the need for filter cleaning
measure any change in oil viscosity
prevent damage to the filter
determine the need for batch filtration
第1题：
A dirty diesel engine oil filter element can best be detected by ______.
A.visual inspection of the elements
B.the pressure drop across the filter
C.high lube oil sump temperature
D.decrease in oil viscosity from the filter
第2题：
contaminated with sludge
contaminated with carbon
diluted with fuel oil
diluted with water
第3题：
The pressure differential across a diesel engine lube oil system duplex filter should be checked to ________.
A.determine the need for filter cleaning
B.measure any change in oil viscosity
C.prevent damage to the filter
D.determine the need for batch filtration
第4题：
excessive crankcase pressure
excessive lube oil temperature
contamination of the lube oil by water
contamination of the cooling water by lube oil
第5题：
visual inspection of the elements
the pressure drop across the filter
high lube oil sump temperature
decrease in oil viscosity from the filter
第6题：
low lube oil temperature
low lube oil pressure
high exhaust temperature
high cooling water pressure
第7题：
allow filtration of less viscous oil
decrease the pressure drop across the filter
improve overall filtration
all of the above
第8题：
What causes the lube oil pressure of the engine to drop ?
第9题：
Worn intake valve guides
Pitted pre-combustion chambers
Loose valve tappets
High exhaust back pressure
第10题：
open the filter and inspect the elements
check the lube oil pump discharge pressure
check the lube oil header pressure
check the pressure drop across the filter