the lubricating pumps are stopped and the access doors are opened
the lubricating pumps are running and the access doors are opened
the engine is running and the access doors are closed
the engine is stopped and the access doors are closed
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：
Overflow valve
Reducing valve
Balancing valve
Reducing valve or balancing valve
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：
visual inspection of the elements
the pressure drop across the filter
high lube oil sump temperature
decrease in oil viscosity from the filter
第5题：
decreased compression pressure
increased lube oil pressure
lower lube oil temperature
excessive leakage past the piston rings
第6题：
Before starting any diesel or gasoline engine, which of the following must be checked?____.
A.Oil level
B.Flow of cooling water
C.Exhaust discharge
D.All of the above
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：
_______can cause oil flow from water outlet of the oil purifier.
A.Oil inlet valve opening too quickly
B.Oil temperature little higher than normal
C.Diameter of gravity disc too small
D.Viscosity of oil little lower than normal
第9题：
crankcase
low lube oil temperature
excessive oil consumption
low bearing oil pressure
第10题：
Visual inspection of the element
the pressure drop cross the filter
high fuel oil tank temperature
increase flow rate from the filter