单选题Low compression of diesel engine may result from ()Aa worn cylinderBbroken piston ringsCany of A and BDnone of the above

单选题
Low compression of diesel engine may result from ()
A

a worn cylinder

B

broken piston rings

C

any of A and B

D

none of the above


参考解析

解析: 暂无解析

相关考题:

Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?A.compression must be low for effective spark ignitionB.compression must be low for required horsepower and torque generationC.compression must be low to prevent pre-ignitionD.compression must be low to have effective pre-ignition

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

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

单选题Worn main bearings in a diesel engine can result in ()Adecreased compression pressureBincreased lube oil pressureClower lube oil temperatureDexcessive leakage past the piston rings

单选题Which of the listed problems can be a cause of low compression pressure in a diesel engine?()Aclogged air filterBcompression strokeCburned exhaust valvesDall of the above

单选题White smoke exhausting from a diesel engine can be caused by a ()Ahigh combustion temperatureBhigh compression pressureCcracked cylinder linerDfuel with a high vanadium content

单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in ()Aa low level in the engine expansion tankBexcessively high coolant pressureCimproper temperaturesDmalfunctioning of the jacket water heater

单选题Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause ().Alow compression pressureBincreased piston wearCincreased cylinder lube oil consumptionDpoor contact between compression rings and liner

单选题A diesel engine emits blue exhaust smoke as a result of()Acold intake airBexcessive compression pressureCexcessive cylinder lubricationDa light load

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A dark exhaust from a running diesel engine can be caused by ()Alate ignitionBwater in the fuelChigh compression temperatureDstarting valve stuck open

单选题Low compression of diesel engine may result from ()Aa worn cylinderBbroken piston ringsCany of A and BDnone of the above

单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?()ALow compression pressure and high exhaust temperatureBLow firing pressure and high exhaust temperatureCLow compression pressure and low exhaust temperatureDLow firing pressure and low exhaust temperature

单选题Late fuel oil injection in a diesel engine can result in ()Afuel knockBincreased powerClow compression pressureDhigh exhaust temperature

单选题A diesel engine should not be operated at low loads for long periods of time because()Aheavy carbon deposits will buildup on the valves and in the exhaustBfuel dilution is increased at low loadCexhaust valves may be damagedDall of the above

单选题Low compression pressure in a diesel engine is caused by()Alow water in the expansion tankBimproperly seated valvesClow fuel oil pressureDworn or broken cylinder liner sealing rings

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High firing pressures and a low exhaust temperature in a diesel engine may result from ().Adecreased piston to cylinder head clearanceBincreased exhaust system back pressureCearly fuel injection timingDlow scavenge air temperature

单选题A diesel engine may be hard to start if the ()Aair intake is restrictedBengine is cranked too fastCvibration dampener is faultyDexhaust back pressure is low

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 reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?()Acompression must be low for effective spark ignitionBcompression must be low for required horsepower and torque generationCcompression must be low to prevent pre-ignitionDcompression must be low to have effective pre-ignition

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Lube oil in the fresh water cooling system of a diesel engine may result from a ()Acamshaft seizureBlube oil pump failureClube oil cooler failureDlube oil pump overflow

单选题In the cylinder of a diesel engine fuel is ignited by the()Aspark from a plug in the pre-combustion chamberBelectrical discharge from the distributorCheat of compression within the cylinderDheat from the fuel injection nozzle

单选题A restricted air intake to a diesel engine may result in the engine ().Afailing to reach rated speedBknocking under maximum loadChunting or surging under light loadDoverspeeding and running away

单选题The function of diesel engine piston compression rings is to ().Aprevent piston side thrustBprevent engine friction lossesCtransmit heat from the piston to the cylinder linerDremove oil from the cylinder combustion space

单选题Piston compression rings used in a diesel engine function to ()Atransfer heat from the cylinder to the pistonBscrape oil from the sides of the pistonCseal the combustion space from the crankcasesDprevent any piston contact with the cylinder liner

单选题Higher than normal temperature air passing through the intake of a diesel engine will result in()Agreater overall efficiencyBgreater fuel economyClower horsepowerDlower compression ratio