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单选题
The cetane rating of diesel fuel is an indication of the （）
A
ignition quality of the fuel
B
calorific value of the fuel
C
flash point of the fuel
D
rate of fuel consumption
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Which of the listed factors will indicate the most about the ability of a fuel to ignite in a diesel engine?A.ViscosityB.Sulfur contentC.Pour pointD.Cetane number
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Which of the following represents the significance the fuel oil cetane number?A.The cetane number has no affect on injection lagB.The cetane number is an indication of the fuel's viscosityC.Ignition lag is reduced with fuels having a high cetane numberD.The cetane number is of little significance in the combustion process
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_______can be a direct cause of faulty operation of diesel engine fuel injection nozzles.A.Excessive fuel nozzle holder coolingB.Sediment in the fuel supplyC.Distortion of the fuel spray patternD.Improper atomization of the fuel
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When fuel is injected late into a diesel engine cylinder_______.A.the exhaust will be clearB.fuel consumption will be lowC.all the fuel will be burned at top dead centerD.fuel consumption will be high
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The cetane number of a diesel fuel oil indicates its ______.A.ignition qualityB.acid contentC.heating valueD.viscosity
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The cetane number of a diesel fuel oil indicates its ______.A.viscosityB.acid contentC.heating valueD.ignition quality
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Persistent knocking in one cylinder of an eight cylinder diesel engine would MOST likely be caused by______.A.using fuel oil with low cetane numberB.a badly worn piston pinC.a loose flywheel keyD.a loose bed plate bolt
考题
单选题Combustion knock will most likely occur as a result of using a fuel with（）A
low ignition qualityB
a high volatilityC
low ignition delayD
a high cetane number
考题
单选题Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）A
water in the fuelB
insufficient fuel for combustionC
clogged air intake passagesD
burning lubricating oil
考题
单选题Fuel oil having a low cetane rating could result in（）A
improved cold weather startingB
excessive fuel oil consumptionC
reduced ignition lagD
smoother engine operation
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Which of the following statements is true concerning the cetane number of diesel fuel?（）A
The cetane number affects the amount of injection lagB
The cetane number is an indication of the fuels viscosityC
Ignition lag is reduced with fuels having a high cetane numberD
The cetane number is of little significance in the combustion process
考题
单选题The cetane number rates fuels for diesel engines according to its （）A
antiknock characteristicsB
ignition qualitiesC
rates of vaporizationD
viscosity
考题
单选题Which of the following statements is true concerning the cetane number rating of diesel fuel? （）A
The cetane number is obtained by comparing the fuel with cetane a colorless liquid hydrocarbonB
The higher the cetane number, the shorter the ignition lagC
The highest cetane number of fuel is 100D
All of the above
考题
单选题The cetane number of a diesel fuel oil indicates its（）A
ViscosityB
acid contentC
heating valueD
ignition quality
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 longer the ignition delay period resulting from improper use of low cetane fuel, the （）A
less fuel will enter the cylinderB
higher the cylinder combustion temperatureC
more complete the fuel combustionD
more rapid the rise in combustion pressure
考题
单选题What is the best indication of the loading of a diesel engine?（）A
Oil temperatureB
Manifold pressureC
Exhaust gas temperatureD
Fuel consumption
考题
单选题If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）A
early injection timingB
worn orifices in the injection nozzlesC
worn or scored cylinder linersD
using a fuel with too low of a cetane number
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单选题Significant retardation of a diesel engine fuel injection timing will result in （）A
smoother engine operationB
advanced fuel ignitionC
increased fuel economyD
reduced engine power
考题
单选题Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.A
excessive fuel nozzle holder coolingB
sediment in the fuel supplyC
distortion of the fuel spray patternD
improper atomization of the fuel
考题
单选题After the ship is out of the harbour and in “Full Speed”, well change （）.A
to fuel oil instead of diesel oilB
for fuel oil instead of diesel oilC
to diesel oil into fuel oilD
for diesel oil into fuel oil
考题
单选题Which of the following represents the significance the fuel oil cetane number?（）A
The cetane number has no affect on injection lagB
The cetane number is an indication of the fuel’s viscosityC
Ignition lag is reduced with fuels having a high cetane numberD
The cetane number is of little significance in the combustion
考题
单选题Fuel injected into a diesel engines cylinder is ignited by （）.A
the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
the fuel injectorD
the fuel pump
考题
单选题A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.A
as much fuel asB
less fuel thanC
less fuel asD
more fuel than
考题
单选题Turbulence in a diesel engine cylinder is of major importance in providing （）.A
proper fuel meteringB
complete fuel/air mixingC
minimal fuel penetrationD
proper fuel timing
考题
单选题The most effective method in removing water from diesel fuel oil is by（）A
centrifuging the fuelB
using it in the engineC
heating the fuel tanksD
starting the fuel
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