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单选题
A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.
A
contaminated with sludge
B
contaminated with carbon
C
diluted with fuel oil
D
diluted with water
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单选题A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.A
contaminated with sludgeB
contaminated with carbonC
diluted with fuel oilD
diluted with water
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单选题Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.A
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excessive lube oil temperatureC
contamination of the lube oil by waterD
contamination of the cooling water by lube oil
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excessive wears of the cooling water pump
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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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Too much piston ring wearC
High lube oil viscosityD
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clogged lube oil pipingB
excessive valve-guide clearanceC
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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
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单选题Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）A
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higher lube oil pressuresC
an increased viscosityD
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单选题Improperly fitted piston rings in a diesel engine can cause（）A
excessive lube oil consumptionB
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单选题Before starting a diesel engine that has an engine driven lube oil pump, the engineer should （）.A
open the bypass lineB
cut in the lube oil coolerC
pressurize the lube oil systemD
top off the expansion tank
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单选题Which of the following conditions can cause excessive lube oil consumption in a diesel engine?（）A
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Low lube oil pressureD
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loss of additives from the lube oilB
carbon deposits in the lube oilC
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decreased viscosityB
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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
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volute pumpB
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gear pump
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单选题Sludge formation in a diesel engine lube oil system is caused by（）A
carbonization of oils from the combustion chambersB
emulsions of lube oil and waterC
coagulation of unburned fuel below the piston ringsD
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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
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the formation of sulfuric acidB
a decrease in lube oil viscosityC
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Excessive lube oil pressureD
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单选题Friction, engine wear and oil consumption in a diesel engine are directly related to the （）.A
acidity of the oilB
pour point of the oilC
flash point of the oilD
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