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单选题
The lube oil pump used in a diesel engine is a （）.
A
volute pump
B
centrifugal pump
C
diaphragm pump
D
gear pump
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Oil oxidation as a result of excessively high lube oil temperature, is harmful to a diesel engine BecauseA.oil foaming will always occurB.large quantities of oil are consumedC.lube oil viscosity is always decreasedD.corrosive by-products are usually formed
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Which of the following is operated from the main engine room console on an automated vessel?A.Fire pump and lube oil pumpB.Lube oil pump and distilling plantC.Distilling plant and shaft alley doorD.Shaft alley door and fixed CO2 release
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Lubrication for the main reduction gears used with diesel engines is usually supplied byA.oil from the main engine sumpB.an independent lube oil systemC.the stern bearing head tankD.the stem bearing sump tank
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In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .A.all of the oil used by the engine through a filterB.some of the oil used by the engine through a filterC.some of the oil used by the engine through a centrifugeD.all of the oil used by the engine through a centrifuge
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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Fuel oil discharged to the diesel engine cylinder is atomized at the （）A
turbochargerB
injection nozzle tipC
carburetorD
fuel oil pump
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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
excessive crankcase pressureB
excessive lube oil temperatureC
contamination of the lube oil by waterD
contamination of the cooling water by lube oil
考题
单选题One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）A
reduce lube oil temperatureB
raise exhaust temperature reduceC
excessive heating of engine roomD
reduce load on cooling water pump
考题
单选题If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）A
a dirty lube oil strainerB
internal water leaksC
an oil suction line restrictionD
excessive wears of the cooling water pump
考题
单选题Which of the listed conditions can cause a diesel engine to use too much lube oil?（）A
Dirty lube oil filterB
Too much piston ring wearC
High lube oil viscosityD
Low lube oil temperature
考题
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
考题
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
考题
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
考题
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
考题
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
考题
单选题If a diesel engine fails to start，one of the likely causes is （）A
low compression temperatureB
low ambient air pressureC
high lube oil pump pressureD
high fuel oil booster pump pressure
考题
单选题A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）A
loss of additives from the lube oilB
carbon deposits in the lube oilC
excessive centrifugingD
excessive fuel dilution
考题
单选题Diesel engine lube oil diluted with fuel oil is indicated by（）A
decreased viscosityB
decreased pour pointC
increased flash pointD
increased viscosity
考题
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
考题
单选题What condition will result in the automatic shutdown of a diesel engine? （）A
High jacket water pressureB
High lube oil pressureC
Low lube oil pressureD
Excessive turbo charger speed
考题
单选题Injection lag in a diesel engine may be caused by（）A
a higher cetane number of fuel oilB
the diesel fuel used having a high viscosityC
mechanical rigidity in the lube pump mechanismD
a decrease rigidity in the fuel pump delivery pressure
考题
单选题The lube oil pump used in a diesel engine is a （）.A
volute pumpB
centrifugal pumpC
diaphragm pumpD
gear pump
考题
单选题Lube oil in the fresh water cooling system of a diesel engine may result from a （）A
camshaft seizureB
lube oil pump failureC
lube oil cooler failureD
lube oil pump overflow
考题
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
all of the above
考题
单选题Excessive piston ring wear in a diesel engine will cause（）A
high lube oil viscosityB
increased lube oil consumptionC
low lube oil temperaturesD
high firing pressures
考题
单选题Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.A
two fuel oil transfer pumps provided where one is to be independent of the main engineB
two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engineC
engine driven transfer pumps and only used in constant speed applicationsD
the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
考题
单选题Misfiring in a diesel engine at light loads can be caused by（）A
high lube oil temperatureB
low lube oil temperatureC
excessive cylinder coolingD
high air injection pressure
考题
单选题Which of the following faults would allow lube oil to enter the cooling system of a diesel engine?（）A
Excessive valve train lubricationB
Leaking standby oil cooler coreC
Excessive lube oil pressureD
Excessive lube oil in the system
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