单选题Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）Agrinding the spare plunger to the barrelBreplacing the plunger and the barrelChighly polishing both the plunger and barrelDreplacing plunger only
单选题
Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）
A
grinding the spare plunger to the barrel
B
replacing the plunger and the barrel
C
highly polishing both the plunger and barrel
D
replacing plunger only
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相关考题：
The plunger in a jerk pump is rotated until the release port is uncovered If the port remains uncovered all of the time, which of the listed operations will occur?A.No fuel will be deliveredB.The maximum effective stroke will be attainedC.The fuel delivered to the cylinder will be excessiveD.The injection nozzle will overheat and carbonize
As the plunger moves upwards in the barrel, injection will commence once the plunger bas_______the spill ports and the pressure builds up.A.opened upB.closed offC.lined upD.taken off
An increase in the fuel injection pump discharge pressure can be caused by a/an _______.A.leaking delivery valveB.excessive bearing end playC.plugged injector spray holeD.increased plunger stroke
The amount of fuel delivered by a helical plunger fuel injection pump is controlled by ______.A.varying the pump discharge pressureB.varying the pump return pressureC.rotation of the pump plungerD.rotation of the pump barrel
利用TCM软件清理Axios光谱仪Plunger的密封圈灰尘的操作步骤是（）A、关闭高压、放真空、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。B、放真空、关闭高压、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。C、放真空、关闭高压、启动TCM软件、选择第二项M、按F1关闭cap、按F2使Plunger向下，再按F1打开cap。D、关闭高压、放真空、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。
单选题When disassembling or assembling an injection pump plunger and barrel you should （）Akeep the parts immersed in diesel fuelBalways keep the plunger and barrel togetherCwork over a linoleum-type surfaceDall of the above
单选题Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）Agrinding the spare plunger to the barrelBreplacing the plunger and the barrelChighly polishing both the plunger and barrelDreplacing plunger only
单选题It is important to note that the injection only takes place when the plunger is moving up the cam （）.Abase circleBslopeCbottom pointDtop point
单选题In a jerk pump, the amount of fuel that will be forced through the spray nozzle on each upward stroke of the plunger depends on （）Athe pump supply pressureBthe slope of the fuel camChow the plunger is rotatedDthe number of sleeve segments engaged with the rack
单选题Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）Achanges the position of the fuel inlet portsBchanges the length of the pump strokeCvaries the quantity of fuel deliveredDvaries the compression of the delivery valve spring
单选题In a unit injector the amount of fuel that will be forced through the spray nozzle on each stroke of the plunger depends on （）Athe pump supply pressureBthe slope of the fuel camChow the plunger is rotatedDthe number of sleeve segments engaged with the rack
单选题The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.AbarrelBramCpistonDrod
单选题Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of（）.Afuel/water separatorsBday tanksCinjector test standDfuel filters
单选题Diesel engine injection lag is caused by（）Acompressibility of the fuelBhigh fuel oil supply flowCscored plunger and barrel packingDexcessive air turbulence
单选题The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.Apinion arrangementBpush rodChandle barDcam device
单选题The fuel injector pump is operated by （） which drives the plunger up and down.Aa separate motorBa camCa generatorDa chain
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
单选题The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）Afuel delivery pressureBpump plunger diameterCplunger control rack positionDtotal pump stroke
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If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）Aonly the replacement of the entire pump would be acceptableBthe injection pump and injection nozzle must be replacedCeither the barrel or plunger must be replacedDthe barrel and plunger must be replaced as a unit
单选题As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.Abeing compressedBto be pumped upCis pressurizedDare built up
单选题The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.AcrankshaftBcamshaftCpiston rodDrack and pinion
单选题A common trouble with the fuel pump plunger or fuel valve spindle is （）.Awater leakageBsteam leakageCoil leakageDair leakage
单选题The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）Avarying the pump discharge pressureBvarying the pump return pressureCrotation of the pump plungerDrotation of the pump barrel
单选题The injector pump is operated by a cam which drives the plunger （）.Atop and bottomBto and froCup and downDback and forth
单选题An increase in the fuel injection pump discharge pressure can be caused by a/an （）Aleaking delivery valveBexcessive bearing end playCplugged injector spray holeDincreased plunger stroke
单选题The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）ANo fuel will be deliveredBThe maximum effective stroke will be attainedCThe fuel delivered to the cylinder will be excessiveDThe injection nozzle will overheat and carbonize
单选题As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.Aopened upBclosed offClined upDtaken off