One cylinder of a diesel engine is persistently knocking and does not cease(停止) when the fuel supply to that cylinder is secured.Which of the following problems may be the cause?A.Low loading of the cylinderB.Excessive cooling of that pistonC.Sluggish ring action on the pistonD.A mechanical defect in a working part
One cylinder of a diesel engine is persistently knocking and does not cease(停止) when the fuel supply to that cylinder is secured.Which of the following problems may be the cause?
A.Low loading of the cylinder
B.Excessive cooling of that piston
C.Sluggish ring action on the piston
D.A mechanical defect in a working part
相关考题：
Persistent knocking in one cylinder of an eight cylinder diesel engine would MOST likely be caused by______.A.using fuel oil with low cetane numberB.a badly worn piston pinC.a loose flywheel keyD.a loose bed plate bolt
How does combustion air enter the cylinder of a two-cycle diesel engine ? Through _______．A.Cylinder head valvesB.PortsC.Turbo chargersD.Bleeder valves
单选题Which of the listed problems would be indicated by an accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?（）AExcessive cylinder linerBwater in the fuel systemCCracked cylinder linerDLeaking lube oil cooler
单选题In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）Ais coming upward；cylinder ring beltBis going downward；piston ring beltCis coming upward；piston ring beltDis going downward；cylinder ring belt
单选题One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）AcrankcaseBpistonCcylinder linerDcrank cheek
单选题In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring grooveAⅠ onlyBⅡ onlyCboth Ⅰ and ⅡDneither Ⅰ nor Ⅱ
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 following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured?（）ALubrication to the defective cylinder should be increasedBCooling water temperature to the engine should be increasedCOnly the turbocharger speed should be reducedDEngine speed should be reduced
单选题When fuel is injected late into a diesel engine cylinder,（）.Athe exhaust will be clearBfuel consumption will be lowCall the fuel will be burned at top dead centerDfuel consumption will be high
单选题When the normal compression ratio of a diesel engine is not very high, misfiring at light loads may be caused by （）Aoverloading the engineBlow exhaust valve liftCexcessive cylinder coolingDinsufficient mechanical clearance
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The most practical way of detecting an overload in one cylinder of an operating large, low-speed ,main propulsion diesel engine is to （）Acheck the cylinder exhausts for black smokeBlisten for combustion knock in that cylinderCisolate each cylinder and inspect the injectorDcheck the cylinder exhaust temperature frequently
单选题One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）AcrankcaseBcylinder headCvalve coverDengine frame
单选题Trunk type diesel engine pistons are effectively cooled when heat is（）Aradiated through the engine blockBtransferred to water cooled cylinder wallsCconducted through the piston crownDtransferred to escaping exhaust gases
单选题In a diesel engine, when the fuel is injected into the cylinder,（）Athe piston is just coming upward from the bottom dead centerBthe piston has moved about one-fifth of the way upCthe piston has moved most of the way up and almost reached the TDCDthe piston has just past the TDC
单选题Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）AOver speedBfire improperlyClose oil pressureDoverheatrapidly
单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）Alow loading of that cylinderBfaulty combustion in that cylinderCsluggish piston ring actionDexcessive piston cooling
单选题Persistent knocking in one cylinder of a diesel engine could be caused by（）.Aa low load on that cylinderBsluggish piston ring actionCexcessive piston crown coolingDexcessive clearance of piston pin
单选题How does combustion air enter the cylinder of a two-cycle diesel engine?（）ACylinder head valvesBPortsCTurbo chargersDBleeder valves
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 diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）Aexcessive cylinder lubricationBa lugging engineCa leaking cylinder linerDoverloading of one cylinder
单选题A faulty injection in one cylinder of an operating diesel engine can be located by （）Acutting out individual injectors and noting engine performanceBchecking lube oil temperatureCchecking cam positionDusing a timing light
单选题One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）Aincrease scavenge air pressureBreduce fuel booster pump pressureCadjust the fuel rackDretard fuel injector timing
单选题Which statement about diesel engine combustion is true?（）ACombustion does not begin until the piston starts down on the power strokeBMaximum combustion pressure is reached before TDCCTurbulence in the cylinder causes a delay in ignitionDMaximum cylinder firing pressure is not developed until the piston passes TDC
单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.AA common rail engine；conventional enginesBA conventional engine；common rail enginesCA marine diesel engine；most other enginesDA two-stroke engine；four-stroke engines
单选题One of function of diesel engine lubricating oil is to （）Ainduce carbon formation on cylinder wallsBimprove fuel penetration in the combustion spaceCform a friction reducing film between mating surfacesDlubricate the fuel injection
单选题When fuel is injected in a diesel engine cylinder too early, （）Aignition may be delayedBfuel economy is not affectedCexhaust gas temperature will be unchangedDthe exhaust will be clear