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
A fuel injection valve opening at pressure lower than normal will result in().
A

late fuel injection

B

early fuel injection

C

high exhaust temperature from that cylinder

D

decreased effective stroke from that injector


参考解析

解析: 暂无解析

相关考题:

High cylinder firing pressure, accompanied by low exhaust temperature, can result from ___.A.improper fuel rack positingB.lengthy exhaust valve durationC.extend operation at light loadD.excessively early injection timing

If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because theA.cylinder compression pressure may not be high enoughB.cylinder compression temperature may be too highC.fuel oil injection pressure may not be high enoughD.scavenge and purge process is incomplete

When using a fuel with a higher than normal sulfur content in an auxiliary four stroke diesel engine, you mayA.maintain higher than normal jacket water temperatureB.change the lube oil more frequently than normalC.maintain a higher air-box temperature than normalD.maintain a higher air-box pressure than normal

Springs in fuel injectors will become not strong enough to work because______.A.the injector opens at a lower pressure than designedB.the needle valve and seat wear outC.the nozzle holes wear outD.long time in use

_______can cause oil flow from water outlet of the oil purifier.A.Oil inlet valve opening too quicklyB.Oil temperature little higher than normalC.Diameter of gravity disc too smallD.Viscosity of oil little lower than normal

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Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?()AImproper fuel rack positioningBLengthy opening of the exhaust valveCExcessively early injection timingDExtended light load operation

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 needle valve in a fuel valve will () when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.Abe jammedBbe openedCbe seatedDbe broken

单选题A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable()Aengine overloadBleaky valvesCstuck or broken piston ringsDlow air injection pressure

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Late fuel injection timing is indicated by ()Alower than normal cylinder pressure and low exhaust temperatureBlower than normal cylinder pressure and high exhaust temperatureChigher than normal cylinder pressure and low exhaust temperatureDhigher than normal cylinder pressure and high exhaust temperature

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 warmer than normal compressor suction line might be caused by ().Ainsufficient lubricationBinsufficient refrigerantCexcess refrigerantDexcessive opening of the expansion valve

单选题During the fuel injection period, fuel pressure must exceed cylinder gas pressure to ().Aensure penetration and distribution of the fuel in the combustion chamberBensure the needle valve is flushed clean during each injectionCprevent combustion gas blowback into the open needle valveDprevent reflected pressure waves when the needle valve closes

单选题Worn diesel engine intake valve guides can result in ()Aincreased engine breathing efficiencyBexcessive valve lashCexcessive lube oil consumptionDlower than normal fuel consumption

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 listed set of conditions indicates early fuel injection timing?()ALoss of engine power and high exhaust temperaturesBHigher than normal firing pressure and low exhaust temperaturesCHigh fuel consumption and high exhaust temperaturesDLower than normal compression pressure and high exhaust temperature

单选题Aburned exhaust valve may be detected by a higher than normal ()Afiring pressureBexhaust temperature from a particular cylinderCcooling water temperatureDcompression pressure

单选题If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the ().Acylinder compression pressure may not be high enoughBcylinder compression temperature may be too highCfuel oil injection pressure may not be high enoughDscavenge and purge process is incomplete

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Early fuel injection timing is indicated by the cylinder pressure being()Aabove normal with a below normal exhaust temperatureBabove normal with a normal exhaust temperatureCbelow normal with a normal exhaust temperatureDbelow normal with an above normal exhaust temperature

单选题High cylinder firing pressure, accompanied by low exhaust temperature, can result from ()Aimproper fuel rack positingBlengthy exhaust valve durationCextend operation at light loadDexcessively early injection timing

单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should()Aincrease the starting air pressureBuse a higher than normal cranking speedCincrease the fuel injection pressureDuse a fuel having a lower ignition temperature

单选题A four-stroke/cycle, 1000horsepower diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperatureThe reason for the failure could be()Aglazed liners or pistonsBhigh lube oil pressureCexcessive compression ratioDworn valve seats and valves

单选题When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should()Amaintain higher than normal jacket water temperatureBchange the lube oil more frequently than normalCmaintain a higher air-box temperature than normalDmaintain a higher air-box pressure than normal