单选题（）is harmful for fuel pumps, fuel valves, cylinder liner, exhaust valve seats, and the turbocharger blades as well.ABad combustion of the fuelBBad atomization of the fuelCLiquid contaminantsDSolid contaminants
单选题
（）is harmful for fuel pumps, fuel valves, cylinder liner, exhaust valve seats, and the turbocharger blades as well.
A
Bad combustion of the fuel
B
Bad atomization of the fuel
C
Liquid contaminants
D
Solid contaminants
参考解析
解析：
暂无解析
相关考题：
Because the timing of injection is crucial, _____ mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.A.gearsB.ramsC.barrelsD.cams
Low compression in a diesel engine could be caused byA.worn or broken cylinder liner sealing ringsB.high cooling water temperatureC.worn or broken piston ringsD.low fuel oil pressure
When fuel is injected late into a diesel engine cylinder_______.A.the exhaust will be clearB.fuel consumption will be lowC.all the fuel will be burned at top dead centerD.fuel consumption will be high
Fuel is admitted to a diesel engine cylinder through the ______.A.injector nozzlesB.carburetorC.exhaust portsD.intake valves
单选题Low compression in a diesel engine can be caused by （）Aclogged coolant passagesBa leaking cylinder head gasketClow fuel oil pressureDworn or broken cylinder liner sealing rings
单选题In each cylinder cover there are two or three holes for （）Athe exhaust valvesBthe fuel valvesCindicator cocksDthe fuel pumps
单选题The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）Aclogged fuel injection pumpsBincreased cylinder liner wearCintake valve stem corrosionDvarnish deposit on pistons
单选题The rate of wear on a cylinder liner depends on the （）Aquality of air filtrationBeffectiveness of lubricationCtype of fuel usedDall of the above
单选题A sudden drop in diesel engine cylinder compression pressure can be caused by（）Aa leaking fuel injector nozzleBa clogged air filterCexcessively early fuel injectionDmalfunctioning valves
单选题A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）Afeel the high pressure fuel lineBcheck the cylinder exhausts for white smoke frequentlyCcheck the cylinder exhaust temperatureDisolate each cylinder and inspect the injector
单选题Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）APlugged injector nozzlesBExcessive fuel injectionCVery late injection timingDIncorrect crankshaft clearance
单选题Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passagesA(1)+(2)B(1)+(3)C(2)+(3)D(1)+(2)+(3)
单选题A drop in compression pressure in one cylinder of a diesel engine can be caused by（）Aa leaking fuel injection nozzleBa clogged air filterCearly fuel injectionDburned valves
单选题In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）Aair intakeBa fuel outletCcooling water inletsDexhausting combustion gas
单选题Low compression in a diesel engine could be caused by（）Aworn or broken cylinder liner sealing ringsBhigh cooling water temperatureCworn or broken piston ringsDlow fuel oil pressure
单选题“The engine not obtaining the sufficient speed for firing” means that （）.Athe start failsBthe fuel pumps will be put into operationCthe fuel valves are damagedDthe combustion process will take over
单选题The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.AbecauseBthoughCsinceDuntil
单选题A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）Aincrease in engine speedBincrease in cylinder turbulenceCleaking needle valveDreduction in cylinder turbulence
单选题Because of the resulting higher pressures in the cylinder from the combustion of this greater mass of fuel, and the larger diameters, the liner must be made （） at the top to accommodate the higher stresses, and prevent cracking of the material.AthinnerBthickerCsmootherDrougher
单选题Low compression pressure in a diesel engine may be the result of （）Ainsufficient fuel supply due to fuel pump valves sticking or leakingBexcessive mechanical clearance between the piston crown and cylinder headCexcessively worn fuel pump plungerDexcessive exhaust back pressure
单选题Engine coolant accumulating in the diesel engine lubricating oil can result from a （）Alow oil pressureBhigh coolant pressureCleaking fuel injectorDcracked cylinder head or liner
单选题A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）Aa leaking fuel injector nozzleBa clogged air filterCexcessively early fuel injectionDmalfunctioning valves
单选题Fuel injected into a diesel engines cylinder is ignited by （）.Athe heat compressed fuel/air mixture in the cylinderBthe fuel igniterCthe fuel injectorDthe fuel pump
单选题In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）Afuel valves；exhaust valveBexhaust valves；inlet valveCfuel valves；inlet valveDexhaust valves；fuel valve
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Turbulence in a diesel engine cylinder is of major importance in providing （）.Aproper fuel meteringBcomplete fuel/air mixingCminimal fuel penetrationDproper fuel timing