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单选题
Cylinder oil is a high viscosity mineral oil, with a （） machined to the anticipated sulfur content of the fuel.
A
TAN
B
TBN
C
SAN
D
SBN
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A dirty diesel engine oil filter element can best be detected by ______.A.visual inspection of the elementsB.the pressure drop across the filterC.high lube oil sump temperatureD.decrease in oil viscosity from the filter
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单选题The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.A
temperatureB
pumping rateC
pressureD
heat
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单选题The adverse effects of burning high sulfur fuel can be compensated for by using a cylinder oil having sufficient（）A
dispersant additivesB
floc pointC
alkalinity additivesD
ignition quality
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单选题The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）A
clogged fuel injection pumpsB
increased cylinder liner wearC
intake valve stem corrosionD
varnish deposit on pistons
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单选题Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）A
employing fuel oil as a cooling mediumB
preventing hard carbon deposit on nozzle tipsC
avoiding fuel oil temperature exceeding builder’s specificationD
ensuring good metallic contact between nozzles and cylinder heads
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单选题A dirty diesel engine oil filter element can best be detected by （）.A
visual inspection of the elementsB
the pressure drop across the filterC
high lube oil sump temperatureD
decrease in oil viscosity from the filter
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单选题The primary purpose of oil control rings on a diesel piston is to（）A
provide a reservoir for cylinder lubricationB
pump oil into the combustion space for cylinder coolingC
prevent excessive lubricating oil consumptionD
allow hydraulic oil film formation on the cylinder
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have a high viscosity indexB
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单选题Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.A
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high temperature and a low viscosityC
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low temperature and a low viscosity
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单选题The viscosity regulator controls the fuel oil temperature （） provide oil at the correct viscosity for combustion.A
in order thatB
because ofC
in order toD
owing to
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Hot spots will developC
Fuel oil viscosity will increasedD
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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
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cooled to increase viscosity
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单选题The tendency for lubricating oil to thin out at high temperatures and thicken at low temperatures will be characterized by a （）.A
low viscosity indexB
high viscosity indexC
high neutralization numberD
low demulsibility quality
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单选题A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）A
a high viscosity indexB
a low viscosity indexC
neutralize acidsD
resist oxidation at high temperatures
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单选题Diesel engine lube oil diluted with fuel oil is indicated by（）A
decreased viscosityB
decreased pour pointC
increased flash pointD
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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The viscosity regulator controls （） in order to provide oil at the correct viscosity for combustion.A
the engines speedB
the engines loadC
the fuel oil temperatureD
the fuel oil flow
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单选题The Total Base Number (TBN) value of diesel engine lube oil refers to its ability to （）A
resist changes in viscosity with changes in temperatureB
resist emulsificationC
neutralize acidsD
resist oxidation at high temperatures
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单选题A condition that can increase the foaming tendency of lube oil is （）A
excessively high oil temperaturesB
water or moisture contaminationC
fuel dilutionD
life its cylinder relief vales
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单选题Lubricating oil viscosity in an operating diesel engine can be reduced by（）A
increasing cooling water flowB
increasing lube oil flowC
dilution by fuel oilD
adding SAE 70 oil
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单选题Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）A
The oil oxidizes and forms carbon depositsB
The viscosity increasesC
Engine oil consumption decreasesD
Lubricating qualities of the oil are enhanced
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单选题Which of the following statements is correct regarding an oil with a high viscosity index?（）A
A large change of viscosity occurs with a minor change in temperatureB
No change in viscosity occurs with any change in temperatureC
Very little change in viscosity occurs with a significant change in temperatureD
The viscosity of the oil increases with an increase in temperature
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