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单选题
A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）
A
increase in engine speed
B
increase in cylinder turbulence
C
leaking needle valve
D
reduction in cylinder turbulence
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单选题In order to ensure perfect atomization, the fuel oil （） before injection.A
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acid contentC
heating valueD
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affect the injection pressureB
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单选题（）is harmful for fuel pumps, fuel valves, cylinder liner, exhaust valve seats, and the turbocharger blades as well.A
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cetane numberC
viscosity in Saybolt secondsD
air fuel ratio
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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
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单选题A change in the degree of fuel atomization in a diesel engine would most greatly affect （）.A
air turbulenceB
fuel penetrationC
fuel spray angleD
fuel injection rate
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单选题With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the（）A
ignition quality of the fuelB
high heating value of the fuelC
amount of carbon residue after combustionD
internal flow resistance in the injectors
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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
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单选题Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）A
The greater the atomization, the greater the penetrationB
The greater the atomization, the less the penetrationC
The degree of atomization has nothing to do with the degree of penetrationD
Atomization and penetration are one and the same
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specific gravityB
cetane numberC
viscosityD
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as much fuel asB
less fuel thanC
less fuel asD
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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
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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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