单选题The high-pressure fuel opens the fuel valve and is sprayed into the cylinder in tiny droplets known as ().AinjectionBpenetrationCatomizationDcompression

单选题
The high-pressure fuel opens the fuel valve and is sprayed into the cylinder in tiny droplets known as ().
A

injection

B

penetration

C

atomization

D

compression


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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

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单选题Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?()AGlazing of the cylinder linersBIncrease valve wearCExcessive oil pumpingDIncrease fuel consumption

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A common trouble with the fuel pump plunger or fuel valve spindle is ().Awater leakageBsteam leakageCoil leakageDair leakage

单选题The vessel is out of harbor and in “Full Ahead”We are going to run fuel oil instead of () and open the fuel oil heater steam valve.Aheavy oilBlube oilCfuel oilDdiesel

单选题If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?()Avalve will open laterBvalves will close laterCamount of fuel injected will be increasedDamount of fuel injected will be decreased

单选题If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an ()Aexcessively late injection timing for each cylinderBincorrectly adjusted intake valve timingCincorrectly adjusted fuel injectorDincorrectly adjusted intake valve clearance

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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The needle valve will open when the fuel pressure acting on the needle valve () exerts a sufficient force to overcome the spring compression.Atape faceBtapered faceCsurfaceDthinner face

单选题If a fire occurs in the boiler room because of a leaking fuel line to a burner, you shut off the fuel using the()Aburner valveBroot valveCquick closing valveDoil return valve

单选题Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and ().AvanadiumBcarbonCcopperDash

单选题Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause()Aerosion and cratering of the nozzle orificesBfuel leakage into the nozzle drain lineCfuel leakage before and after injectionDinsufficient fuel delivery though that nozzle

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