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What quality of a diesel fuel is most significant for efficient combustion ________．
A.Volatility
B.Viscosity
C.Flash point
D.Specific heat
参考答案
更多 “ What quality of a diesel fuel is most significant for efficient combustion ________．A.VolatilityB.ViscosityC.Flash pointD.Specific heat ” 相关考题
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Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ____.A.prolong the ignition delay periodB.ensure the beginning of fuel injectionC.thoroughly utilize the air chargeD.allow controlled fuel combustion
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The separation of impurities and water from ______is essential for good combustion of diesel engines.A.lube oilB.fuel oilC.turbine oilD.grease
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单选题A leaking diesel engine fuel injector will cause（）A
prolonged maintenance intervalsB
improved atomizationC
greater fuel economyD
incomplete combustion
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单选题In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）A
injection lagB
ignition delayC
compressionD
turbulence lag
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单选题Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.A
a shortened ignition delay periodB
a lean fuel/air mixtureC
excess fuel in the combustion chamberD
rapid vaporization of injected fuel droplets
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单选题The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as （）.A
delivering the same quantity of fuel to each cylinder for each power stroke according to engine loadB
maintaining the metering adjustment for a reasonable period under all load conditionsC
timing fuel injection to obtain maximum power and good fuel economyD
distributing the fuel to all parts of the combustion chamber for proper combustion
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单选题The cetane number of a diesel fuel oil indicates its（）A
ViscosityB
acid contentC
heating valueD
ignition quality
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单选题Proper atomization of fuel in diesel engine combustion chambers will （）.A
affect the injection pressureB
improve combustionC
reduce compression pressureD
decrease power output
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单选题The rate of fuel injection in a diesel engine cylinder depends primarily on （）.A
the size of the holes in the fuel nozzleB
timing of the pumpC
supply pressure to the pumpD
shape of the combustion chamber
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单选题The ignition quality of diesel fuel is indicated by its（）A
octane numberB
cetane numberC
viscosity in Saybolt secondsD
air fuel ratio
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单选题The longer the ignition delay period occurs in a diesel engine, the （）.A
less fuel will enter the cylinderB
lower will be cylinder compression temperaturesC
more complete will be fuel combustionD
more rapid will be the rise in combustion pressure
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单选题Combustion knock occurring in a diesel engine can be caused by （）.A
excessive fuel penetrationB
prolonged injection lagC
reduced ignition lagD
prolonged ignition lag
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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
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单选题The efficient burning of fuel in a diesel engine is dependent upon the （）A
temperature of compressionB
atomization of the fuelC
penetration of the fuelD
all of the above
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单选题The ignition quality of a diesel fuel oil is indicated by the （）A
specific gravityB
cetane numberC
viscosityD
calorific valve
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单选题In the cylinder of a diesel engine fuel is ignited by the（）A
spark from a plug in the pre-combustion chamberB
electrical discharge from the distributorC
heat of compression within the cylinderD
heat from the fuel injection nozzle
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单选题Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in （）A
hard startingB
excessive fuel consumptionC
loss of powerD
all of the above
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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Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）A
prolong the ignition delay periodB
ensure the beginning of fuel injectionC
thoroughly utilize the air chargeD
allow controlled fuel combustion
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单选题The most common diesel engine fuel system problems are caused by （）.A
incorrect adjustmentsB
dirty fuelC
broken fuel linesD
excessive vibration
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单选题The cetane rating of diesel fuel is an indication of the （）A
ignition quality of the fuelB
calorific value of the fuelC
flash point of the fuelD
rate of fuel consumption
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单选题Proper dispersion of fuel in a diesel engine cylinder is dependent upon the （）A
injection pressureB
shape of combustion spaceC
turbulence in combustion spaceD
all of the above
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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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