单选题Fuel injection systems meter fuel, atomize fuel, and ().Acreate turbulence in the combustion chamberBaid in completing cylinder scavengingCinject fuel at the proper timeDminimize fuel penetration into the cylinder

单选题
Fuel injection systems meter fuel, atomize fuel, and ().
A

create turbulence in the combustion chamber

B

aid in completing cylinder scavenging

C

inject fuel at the proper time

D

minimize fuel penetration into the cylinder


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If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at theA.fuel line connections to the cylinder injection valvesB.gasket surfaces of the fuel oil filtersC.discharge fittings of the fuel injector pumpsD.suction side of the fuel oil transfer pump

_______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 primary function of a fuel delivery check valve assembly is to()Adeliver proper fuel quantity to the injection nozzleBprovide rapid fuel injection cutoffCcontrol fuel quantity entering the pump bodyDcontrol fuel pressure delivered to the combustion chamber

单选题If the needle valve in a fuel injection nozzle sticks open ().Ano fuel will be delivered through the nozzleBthe nozzle will overheat and crackCtime of injection will changeDfuel will leak into the drain line

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 fuel leak occurs in the high pressure fuel piping between the injection pump and fuel nozzleThis requires immediate repair because of the ()Ahigh cost of fuelBserious fire hazardCpossibility of pollutionDpoor combustion which will occur in that cylinder

单选题The main source of fuel injection system malfunctions is ()Aimproper adjustmentsBcontaminated fuelCcoated fuel linesDexcessive vibration

单选题The term “proper metering”, as applied to a diesel fuel injection system, can be best defined as ().Adelivering the same quantity of fuel to each cylinder for each power stroke according to engine loadBmaintaining the metering adjustment for a reasonable period under all load conditionsCtiming fuel injection to obtain maximum power and good fuel economyDdistributing the fuel to all parts of the combustion chamber for proper combustion

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Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?()AThe amount of fuel injected will be increasedBThe start of injection will be retardedCThe nozzle will permit fuel to dribbleDThe spray pattern will be distorted

单选题A fuel injection valve opening at pressure lower than normal will result in().Alate fuel injectionBearly fuel injectionChigh exhaust temperature from that cylinderDdecreased effective stroke from that injector

单选题The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to ().Aassist in a quick cutoff of fuel injectionBallow oil backflow from the injector to the helixCreduce fuel oil pressure between injection strokesDmeter the quantity of fuel delivered

单选题The major cause of fuel pump and injection system problems is ()Aimproper adjustmentsBcontaminated fuelCkinked fuel linesDexcessive engine vibration

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

单选题Faulty operation of diesel engine fuel injection nozzles can be a direct cause of().Aexcessive fuel nozzle holder coolingBsediment in the fuel supplyCdistortion of the fuel spray patternDimproper atomization of the fuel

单选题Faulty operation of diesel engine fuel injection nozzles can be directly caused by ().Awater in the fuel oil supplyBexcessive fuel nozzle holder coolingCa distorted fuel spray patternDleakage past the plunger into the oil drain

单选题A diesel engine will lose power if fuel injection occurs too late in the cycle, because the()Afuel droplets will burn as they leave the fuel injectorBfuel will not be properly atomized in the cylinderCmaximum expansion of the burned fuel cannot take place in the cylinderDcompression pressure will be too low to cause fuel ignition

单选题When a fuel injection nozzle overheats, which of the problems listed can be expected?()AThe fuel metering will varyBThe fuel will explodeCThe cylinder head will crackDThe engine will stop

单选题Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?()ACommon-rail injectionBAir injectionCJerk pump injectionDDistribution injection

单选题In common rail engines, the fuel is() before is injected into the cylinders.Astored in a common fuel lineBpumped by the injection pumpCat low pressureDalready atomized

单选题Fuel injection systems meter fuel, atomize fuel, and ().Acreate turbulence in the combustion chamberBaid in completing cylinder scavengingCinject fuel at the proper timeDminimize fuel penetration into the cylinder