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
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 （）
A
fuel line connections to cylinder injection valves
B
gasket surfaces of the fuel oil filters
C
discharge fitting of the fuel injector pumps
D
suction side of the fuel oil tran
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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
Cold weather starting of a diesel engine is more difficult than warm weather starting due toA.use of low viscosity oil in cold weatherB.increased moisture content of inlet air in cold weatherC.increased drag of pistons and bearings due to increased oil viscosityD.higher compression pressures reached due to smaller clearances existing in the engine during cold weather
If you are unable to stop a diesel engine by any other means，you should ______．A.Discharge a CO2 extinguisher in the air inletB.Pull off the distributor capC.Secure the jacket waterD.Secure the starting air supply valve
单选题Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）Aincrease in starting air pressureBincrease in lube oil viscosityCcompression expansion deviceDjacket water heater
单选题A diesel engine may fail to start due to （）Alow air charge temperatureBhigh cranking speedCexcessive fuel dilution of lube oilDhigh compression pressure
单选题Which of the listed diesel engine systems is likely to create the problem of a cylinder regularly misfiring?（）ALubricationBCoolingCFuelDElectric ignition
单选题If you are unable to stop a diesel engine by any other means，you should（）.Adischarge a CO2 extinguisher in the air inletBpull off the distributor capCsecure the jacket waterDsecure the starting air supply valve
单选题When attempting to start a main propulsion diesel engine, the engine, the engine turns at the proper speed but will not startYou should check the（）Astarting air pressureBscavenge air pressureCover-speed tripDbanjo oiler line
单选题Diesel engine air start system check valves are opened by （）Aan air start camBcylinder compression pressureCstarting air pressureDvalve springs
单选题Cold weather starting of a diesel engine is more difficult than warm weather starting due to（）Ause of low viscosity oil in cold weatherBincreased moisture content of inlet air in cold weatherCincreased drag of pistons and bearings due to increased oil viscosityDhigher compression pressures reached due to smaller clearances existing in the engine during cold weather
单选题If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.Acompression pressures are below normalBlube oil is diluted with fuel oilCcranking speed is too lowDexhaust system is partially restricted
单选题What is the effect of heated intake air on a diesel engine? （）AIncreases efficiencyBIncreases engine horsepowerCIncreases engine lifeDReduces engine horsepower
单选题As for a diesel engine, lack of combustion air may be due to （）.Afouling turbineBfuel pump faultsClubrication failureDexcessive cooling
单选题A large two-stroke/cycle direct reversing diesel engine is to be reversedPrior to the admission of starting air you must （）Aline up the engine fore restarting with light diesel oilBreposition the fuel injection camCchange the intake and exhaust valve cam positionsDplace the starting cam in the intermediate position
单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）Aimmediately open all crankcase relief portsBincrease crankcase exhauster speed to draw cool air into the engineCallow the engine to cool naturallyDincrease crank case scavenge air to remove unburned gases
单选题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.Aloss of suction in the circulating pumpBleak in the primary cooling systemCbroken raw water pump shaftDburned or cracked piston in one cylinder
单选题One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）Adecrease in ignition lagBincrease in fuel economyCreduction in lube oil viscosityDincrease in cylinder misfiring
单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）Ahas little or no internal frictionBhas a lower effective compression ratioCoperates with scavenge air under a positive pressureDoperates without energy absorbing intake and exhaust strokes
单选题An automated diesel engine should normally shut down due to （）Alow lube oil temperatureBhigh ambient air temperatureClow tube oil pressureDhigh exhaust system back pressure
单选题If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）Acavitation erosion in the water jacketsBexcess corrosion inhibitor in the coolantCdirty jacket water coolerDdefective turbocharger
单选题A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.Athe engine was over filledBthere might be a fuel leakCthere might be a water leakDall of the above
单选题An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）Arestricted turbocharger air intakeBoil leak into the turbochargerCdribbling injectorDlow fuel viscosity
单选题If you notice smoke coming fro the crankcase exhaust fan outlet of an operating diesel engine, you would suspect（）Aa cracked cylinder linerBclogged intake portsCbroken piston ringsDa faulty head gasket
单选题While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）Athe bearing had been overheatedBwater was present in the oilCthe lube oil was not being properly filteredDthe maximum allowable bearing pressure had been exceeded
单选题If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）Acheck the air filter for obstructionBcheck for an exhaust leakCcheck the exhaust temperatureDsecure the engine
单选题Compared to a naturally aspirated diesel engine, a supercharged diesel engine has（）Aa cylinder air charge of higher pressureBincreased pumping lossesCless valve overlapDreduced blow-by
单选题Misfiring in a diesel engine at light loads can be caused by（）Ahigh lube oil temperatureBlow lube oil temperatureCexcessive cylinder coolingDhigh air injection pressure