If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.A.the crankcase explosionB.lifting of the cylinder safety valveC.a scavenge fireD.opening of the manhole
If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.
A.the crankcase explosion
B.lifting of the cylinder safety valve
C.a scavenge fire
D.opening of the manhole
相关考题：
Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?A.Control the amount of lube oil burned in the combustion chamberB.Transmit heat from the piston to the cylinder linerC.Prevent damage to ring groove inserts by acting as a heat damD.Dissipate combustion chamber gas pressure by channeling it through the ring gap
Diesel engine blow-by is the leakage of combustion gases past the( ).A.oil rings onlyB.compression and scraper ringsC.cylinder liner sealingD.cylinder liner ring grooves
The diesel engine is similar to the gasoline engine in that______.A.both of them are ignited by compressed airB.both of them are the forms of external combustion enginesC.both of them have spark plugsD.the power is developed by the piston in the cylinder
单选题In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs （）Aonce every crankshaft revolutionBonce every two crankshaft revolutionsConce every piston strokeDtwice every piston stroke
单选题To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.Aprevent any lubricant from reachingBprevent excessive lubrication from reaching the combustion spaceCProvide metal-to-metal contact to seal the cylinder against blow-byDassure a positive means of scraping carbon accumulation from the cylinder
单选题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）Astarting the engine while hotBknurling the piston skirtCoperating the engine overheatedDscuff resistant piston rings
单选题The diameter of a piston is usually less at the crown than at the skirt, in order to （）.Afacilitate the installation of piston ringsBallow for the expansion of the piston during operationCprevent crankcase vapors from entering the combustion chamberDreduce wearing of the upper cylinder liner
单选题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）Achromium plating piston ringsBknurling the piston skirtCextended maximum power operationDapplying load to a cold diesel engine
单选题Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）AControl the amount of lube oil burned in the combustion chamberBTransmit heat from the piston to the cylinder linerCPrevent damage to ring groove inserts by acting as a heat damDDissipate combustion chamber gas pressure by channeling it through the ring gap
单选题The diesel engine is similar to the gasoline engine in that （）.Aboth of them are ignited by compressed airBboth of them are the forms of external combustion enginesCboth of them have spark plugsDthe power is developed by the piston in the cylinder
单选题A disadvantage of a four-stroke/cycle diesel engine is （）Ahigher working temperature of piston and cylinderBthe use of scavenge portsCfewer power strokes per revolution of the crankshaftDpart of the fuel is burned as the piston is moving away from top dead center
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The function of the piston compression rings used in a diesel engine is to （）Aseal the space between the piston and linerBtransmit heat from the piston to the cylinder linerCreduce the amount of combustion gas blow-byDall of the above
单选题The main purpose of the piston oil scraper rings is to （）.Aseal the space between the piston and the linerBreduce the amount of lube oil burned in the combustion chamberCtransmit heat from the piston to the cylinder linerDdamp out fluctuations of the piston side thrust
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Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）Acylinder valvesBcompression ringsCpiston skirtsDoil rings
单选题If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in （）.Athe crankcase explosionBlifting of the cylinder safety valveCa scavenge fireDopening of the manhole
单选题The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the （）Aexpansion of the combustion gasesBexhaust and intake valves just closingCmaximum compression is just being attainedDfuel injection occurring at that point and combustion begins
单选题For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.Athe cylinder coverBthe bottom of bed-plateCthe sumpDthe crankcase door
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For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.Acylinder casingBcylinder boreCcrankcase doorDaperture in the cylinder block
单选题For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.Ait has a longer power strokeBmore air gets into the cylinder each strokeCit develops twice as many power strokes at the same speedDhigher combustion pressure is developed
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A piston is said to be at top dead center when it is （）Aopening the exhaust portsBplaced on top of the engine along its centerlineCfarthest from the cylinder headDnearest to the cylinder head
单选题A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.Acrankshaft revolutionBmechanical cycle of operationCperiod of two combustion cyclesDcycle of two events