Which of the following problems is the main source of fuel pump and injection system malfunctions?A.Improper lubricationB.Air in the fuel systemC.Coated fuel linesD.Excessive vibration
Which of the following problems is the main source of fuel pump and injection system malfunctions?
A.Improper lubrication
B.Air in the fuel system
C.Coated fuel lines
D.Excessive vibration
相关考题：
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
The major cause of fuel pump and injection system problems is _____.A.improper adjustmentsB.contaminated fuelC.kinked fuel linesD.excessive engine vibration
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
单选题The major cause of fuel pump and injection system problems is （）Aimproper adjustmentsBcontaminated fuelCkinked fuel linesDexcessive engine vibration
单选题The main source of fuel injection system malfunctions is （）Aimproper adjustmentsBcontaminated fuelCcoated fuel linesDexcessive vibration
单选题Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.AcontrollerBgovernorCinstrumentDapparatus
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Which of the following problems is the main source of fuel pump and injection system malfunctions?（）AImproper lubricationBAir in the fuel systemCCoated fuel linesDExcessive vibration
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Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?（）AFuel injection timing will changeBNozzle operation will be unaffectedCFuel will leak into the drain lineDFuel will not be delivered
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 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 most common diesel engine fuel system problems are caused by （）.Aincorrect adjustmentsBdirty fuelCbroken fuel linesDexcessive vibration
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Which of the following machinery space operations is required to be logged in the Oil Record Book?（）ABallasting or cleaning of fuel oil tanksBShifting suction of main fuel pump to reserve fuel oil tankCChanging out sprayer plates to adjust for steam demandDDaily inspection of engine room bilges
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 major cause of problems occurring with fuel injection equipment is（）Aincorrect replacement of barrels and plungers of jerk pumpsBoverheating of the nozzle orificesCcracked pump housingsDdirt in the fuel
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A full-flow 50μm filter is installed ,（） so the injection system components on the main engine are safeguarded.Aas close to the main engine as possibleBas close to the main pump as possibleCjust before the fuel valveDjust before the booster pump
单选题The fuel injection system is very important, so any trouble of it will （） the operation of the main engine.Abe affectedBaffectCbe effectedDeffect
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