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单选题
The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）
A
the same, whether at sea, or during maneuvering
B
adjusted during each hour of operation while at constant RPM
C
higher at sea than while maneuvering
D
lower at sea than while maneuvering
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An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with________.A.graphite packingB.sealing compoundC.lubricating oilD.gaskets
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单选题The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）A
the same, whether at sea, or during maneuveringB
adjusted during each hour of operation while at constant RPMC
higher at sea than while maneuveringD
lower at sea than while maneuvering
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单选题Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）A
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the turbine blade temperatureC
the flow rate of fuelD
scavenge air pressure
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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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单选题A high rate of separation between oil and water is favored by （）.A
large size of oil globuleB
low temperatureC
high viscosityD
high flow rate
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单选题In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.A
additivesB
waterC
greaseD
acid solution
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单选题One characteristic of a lubricating oil adversely affecting the result of centrifuging is （）A
high TBN valueB
low oil floc pointC
low oil demulsibilityD
low oil neutralization number
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单选题Excessive lubricating oil consumption in a running diesel engine can be caused by （）A
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excessive valve-guide clearanceC
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单选题Cylinder wall temperature, fuel oil supplier, and oil passage （）.A
are interdependentB
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单选题The oil pressure and flow from each bearings can be checked when（）A
the lubricating pumps are stopped and the access doors are openedB
the lubricating pumps are running and the access doors are openedC
the engine is running and the access doors are closedD
the engine is stopped and the access doors are closed
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单选题（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.A
The fuel oilB
The lube oilC
The sea waterD
The fresh water
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单选题The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices during （）A
the upward strokeB
the downward strokeC
the power strokeD
the suction stroke
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单选题It is very necessary that each cylinder （） before the charged air is compressed.A
is scavengedB
is atomized with fuel oilC
be scavengedD
be atomized with fuel oil
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单选题（） for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.A
The driven gearB
The driveC
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单选题The lubricating system for the cylinder walls is different from the bearings in that the oil for former one is supplied in （） while that for latter one is （）.A
sufficient quantity； measuredB
measured quantity；sufficientC
excessive quantity；sufficientD
the less quantity the better；the more the better
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单选题The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）A
Proper timingB
Accurate meteringC
Suitable injection rateD
Suitable atomization rate
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单选题On engines having oil cooled pistons the lubricating oil pre-heater must be put into operation and the rate of heating so （） that the temperature of the piston cooling oil returns are 32℃ to 35℃ over a period of at least two hours.A
slowB
quickC
arrangedD
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单选题If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its （）A
fuel pump should be removed and all connections blanked offB
cylinder oil feed rate should be increased slightly above that used at normal sea speedC
cylinder oil feed rate should be reducedD
cylinder oil feed rate should be increased to the maximum flow capable of the metering pump
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单选题The （）should be kept running for about half an hour after FWE.A
crankcase lubricating oil pumpB
fuel oil pumpC
air compressorD
auxiliary blower
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单选题Engine coolant accumulating in the diesel engine lubricating oil can result from a （）A
low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
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单选题In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.A
metal particles loosened by wearB
air when no air cleaners are usedC
condensation of water vaporsD
breakdown of the lubricating oil by dilution
考题
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
考题
单选题The function of lubricating oil is to （）.A
reduce friction between moving surfacesB
provide even distribution of bearing wearC
reduce the accumulation of harmful detergentsD
maintain a constant oil temperature output at each beating
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单选题One of function of diesel engine lubricating oil is to （）A
induce carbon formation on cylinder wallsB
improve fuel penetration in the combustion spaceC
form a friction reducing film between mating surfacesD
lubricate the fuel injection
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单选题Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）A
SplashB
GravityC
PressureD
Bypass
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单选题Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.A
the power strokeB
the compression strokeC
low load operation onlyD
periods of standby
考题
单选题The （）pump is usually used as the lubricating oil pump.A
turbineB
screwC
vaneejectorD
centrifugal
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