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单选题
Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.
A
under high pressure
B
under low pressure
C
heated to reduce viscosity
D
cooled to increase viscosity
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Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.A.refrigerant bubbles in the lube oilB.refrigerant reducing the lube oil viscosityC.oxidation(氧化) of the lube oil from overheatingD.reducing the floc or cloud point of the oil
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all of the above
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viscosity is too lowB
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单选题To determine if the lube oil filter elements need changing, （）.A
open the filter and inspect the elementsB
check the lube oil pump discharge pressureC
check the lube oil header pressureD
check the pressure drop across the filter
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单选题The lube oil cooler is located after the lube oil filter in order for （）A
the filter to operate more efficientlyB
the lube oil cooler to be bypassedC
positive lube oil pump suction to be assuredD
galvanic action in the cooler to be minimized
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单选题A lube oil filter can be used to remove most contaminants from lube oilA contaminant which will remain in the lube oil after filtering is （）.A
acidB
fuel oilC
sedimentD
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单选题Which of the listed conditions can cause a diesel engine to use too much lube oil?（）A
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High lube oil viscosityD
Low lube oil temperature
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单选题Excessive lubricating oil consumption in a running diesel engine can be caused by （）A
clogged lube oil pipingB
excessive valve-guide clearanceC
high lube oil viscosityD
low lube oil temperature
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单选题In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.A
lube oil pump suction lineB
lube oil pump discharge lineC
bottom of the lube oil sumpD
outlet from the lube oil header
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单选题Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）A
an increased flash pointB
higher lube oil pressuresC
an increased viscosityD
lower lube oil pressures
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单选题When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.A
filter to remove the fuel oilB
use the settler to remove the fuel oilC
remove the fuel oil by centrifugingD
drain and then renew the lube oil supply
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单选题It is necessary for us （） after having served for a certain period.A
to change the lube oilB
have the lube oil purifiedC
have the lube oil burntD
to analyze the lube oil
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单选题Which of the following conditions can cause excessive lube oil consumption in a diesel engine?（）A
Low lube oil temperatureB
Dirty lube oil strainerC
Low lube oil pressureD
High lube oil temperature
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单选题Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.A
under high pressureB
under low pressureC
heated to reduce viscosityD
cooled to increase viscosity
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单选题Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?（）A
Water discharging from the water outlet of the lube oil purifierB
Fuel oil discharging from the water outlet of the lube oil purifierC
Lube oil discharging from the water outlet of the lube oil purifierD
A change in the lube oil viscosity
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单选题A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）A
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WaterC
Lubricating oilD
sulphur compounds
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单选题Which of the following problems will occur if a disk-type centrifugal lube oil purifier is not properly primed prior to admitting oil flow to the bowl?（）A
Contamination of the lube oil by emulsification will resultB
The lube oil will not be subjected to the proper centrifugal forceC
The lube oil will overheat and flashD
Oil will discharge from the heavy phase discharge port and be wasted
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单选题Demulsibility of a lube oil is defined as （）.A
the ability of oil to separate from waterB
the temperature at which oil flows rapidlyC
a measure of the water in a lube oil systemD
an emulsion of different grades of oil
考题
单选题Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil（）.A
TBN numberB
viscosityC
temperatureD
foaming
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单选题If a used lube oil analysis indicates an excessive chromate content, this means （）A
air filtration is inadequateB
engine coolant leaking into the lube oilC
fuel oil is leaking into the lube oilD
the piston rings are excessively worn
考题
单选题If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）A
changedB
centrifugedC
filteredD
settled
考题
单选题When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.A
acidB
sludgeC
mechanical impurityD
salinity
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单选题Excessive piston ring wear in a diesel engine will cause（）A
high lube oil viscosityB
increased lube oil consumptionC
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high firing pressures
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refrigerant bubbles in the lube oilB
refrigerant reducing the lube oil viscosityC
oxidation of the lube oil from overheatingD
reducing the floc or cloud point of the oil
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