单选题Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.Alower compression pressuresBoverheating without smokingCfailure to startDa run away without load
单选题
Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.
A
lower compression pressures
B
overheating without smoking
C
failure to start
D
a run away without load
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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
Crankcase explosions in propulsion diesel engines result from ____.A.the splashing of lubrication oil by the crankshaftB.the dilution of crankcase oil with particles of combustionC.broken fuel lines spraying oil on the crankcaseD.the ignition of unburned fuel and air in the crankcase
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
_______can be a direct cause of faulty operation of diesel engine fuel injection nozzles.A.Excessive fuel nozzle holder coolingB.Sediment in the fuel supplyC.Distortion of the fuel spray patternD.Improper atomization of the fuel
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Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）Aemploying fuel oil as a cooling mediumBpreventing hard carbon deposit on nozzle tipsCavoiding fuel oil temperature exceeding builder’s specificationDensuring good metallic contact between nozzles and cylinder heads
单选题The burning of fuel oil in a diesel engine having a high sodium content, will cause （）Acorrosion and grooving of exhaust valvesBcorrosion and gumming of the fuel injection pumpCsalt deposits in the exhaust manifoldDslag deposits in the fuel injection equipment
单选题Air in the fuel lines of a diesel engine can cause （）Aignition failureBoxygen corrosion of the fuel linesCthe pistons to seizeDblue smoke
单选题Diesel engine injection lag is caused by（）Acompressibility of the fuelBhigh fuel oil supply flowCscored plunger and barrel packingDexcessive air turbulence
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单选题Outlets in gasoline fuel lines are（）.Apermitted for drawing fuel samplesBpermitted for draining fuel from linesCpermitted for bleeding air from linesDprohibited
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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Crankcase explosions in propulsion diesel result from（）Athe splashing of lubrication oil by the crankshaftBthe dilution of crankcase oil with particles of combustionCbroken fuel lines spraying oil on the crankcaseDthe ignition of unburned fuel and air in the crankcase
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
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单选题If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the （）Afuel line connections to cylinder injection valvesBgasket surfaces of the fuel oil filtersCdischarge fitting of the fuel injector pumpsDsuction side of the fuel oil tran
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单选题Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to （）Aburn excessive amounts of lube oilBoverheat without smokingCoperate with reduce power or stopDrun away without load