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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 turbulence
B
fuel penetration
C
fuel spray angle
D
fuel injection rate
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单选题An auxiliary diesel engine may fail to start due to()A
low exhaust back pressureB
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excessive fuel atomization
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单选题In order to ensure perfect atomization, the fuel oil () before injection.A
has to be cooledB
has heatedC
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单选题Duty officer informs us that the vessel is out of harbor and in “Full Ahead”We are going to run ().A
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单选题Proper atomization of fuel in diesel engine combustion chambers will ().A
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单选题The ash content of a fuel oil is significant to the operating engineer because it ()A
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reflects the overall thermal efficiency of the fuel oil service system
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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
Bad combustion of the fuelB
Bad atomization of the fuelC
Liquid contaminantsD
Solid contaminants
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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 speedB
increase in cylinder turbulenceC
leaking needle valveD
reduction in cylinder turbulence
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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
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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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单选题What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?()A
Spark plugB
Heat of compressionC
CarburetorD
Glow plug
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to fuel oil instead of diesel oilB
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the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
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incorrect adjustmentsB
dirty fuelC
broken fuel linesD
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单选题The degree to which the viscosity of an oil will change with a change in temperature is indicated by the ().A
weight designationB
viscosity indexC
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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
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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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