单选题The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the ()AcamshaftBcrankshaftCgovernorDflywheel

单选题
The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the ()
A

camshaft

B

crankshaft

C

governor

D

flywheel


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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

单选题The main purpose of changing main engine to electronic controlled is not to()Acontrol fuel injection time more preciselyBcontrol fuel injection rate more preciselyCmeet the environmental requirementsDmeet high engine speed requirements

单选题When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer,the ()Aquantity of fuel injected is decreasedBquantity of fuel injected will always be increasedCstart of injection is advancedDduration of injection will always be greater

单选题The burning of fuel oil in a diesel engine having a high sodium content, will cause ()Acorrosion and grooving of exhaust valvesBcorrosion and gumming of the fuel injection pumpCsalt deposits in the exhaust manifoldDslag deposits in the fuel injection equipment

单选题Problems with the diesel engine fuel injection pump are usually caused by()Aimproper adjustmentBcontaminated fuelCkinked fuel linesDexcessive engine vibration

单选题When the opening pressure of a diesel engine fuel injector is greater than that specified by the engine manufacturer, which of the following problems can be expected?()AQuantity of fuel injected tends to be decreasedBQuantity of fuel injected will always be increasedCStart of injection tends to be advancedDDuration of injection will always greater

单选题A drop in compression pressure in one cylinder of a diesel engine can be caused by()Aa leaking fuel injection nozzleBa clogged air filterCearly fuel injectionDburned valves

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单选题If a diesel engine turned over at normal cranking speed but failed to start, the cause could be late fuel injection or ()Aexcessive fuel pressureBhigh lube oil viscosityCinadequate fuel injectionDexcessive starting air pressure

单选题The rate of fuel injection in a diesel engine cylinder depends primarily on ().Athe size of the holes in the fuel nozzleBtiming of the pumpCsupply pressure to the pumpDshape of the combustion chamber

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单选题Which of the following is true about the fuel injection with an ordinary diesel engine?()AThe process begins after TDCBThe process ends before TDCCWhen the piston is near to the TDC the fuel injection endsDNone of the above is true

单选题Injection lag in a diesel engine may be caused by()Aa higher cetane number of fuel oilBthe diesel fuel used having a high viscosityCmechanical rigidity in the lube pump mechanismDa decrease rigidity in the fuel pump delivery pressure

单选题The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by()Athe firing pressure in the cylinderBa metering helix inside the pumpCvarying the physical length of the plunger strokeDvarying the clearance between the injector cam and the injector rocker arm

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单选题Combustion knock occurring in a diesel engine can be caused by ().Aexcessive fuel penetrationBprolonged injection lagCreduced ignition lagDprolonged ignition lag

单选题Significant retardation of a diesel engine fuel injection timing will result in ()Asmoother engine operationBadvanced fuel ignitionCincreased fuel economyDreduced engine power

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单选题Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ()Aprolong the ignition delay periodBensure the beginning of fuel injectionCthoroughly utilize the air chargeDallow controlled fuel combustion

单选题A common rail engine has only one or two high pressure pumps in operation at the same()time, and the injection into each cylinder.Acan’t be controlled very preciselyBcan’t be controlled as flexibly as the separate pump systemCcan be controlled as flexibly as the separate pump systemDcan be controlled more precisely and flexibly

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