单选题The main function of piston compression rings is to （）Aprevent excessive cylinder liner wearBreduce friction losses in the engineCseal the space between the piston and the linerDlimit upward flow of lube oil into the combustion space
单选题
The main function of piston compression rings is to （）
A
prevent excessive cylinder liner wear
B
reduce friction losses in the engine
C
seal the space between the piston and the liner
D
limit upward flow of lube oil into the combustion space
参考解析
解析：
暂无解析
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
Among the rings of a piston the ______one is subjected to the greatest load and temperature.A.bottomB.middleC.topD.any position
Before replacing a piston you should check that all rings are ___.A.freeB.fastenedC.brokenD.stuck
单选题Around the combustion chamber, all the main components are to give low thermal strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）Adrill cooledBhole cooledCtube cooledDbore cooled
单选题If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?（）AThe oil control rings will seal improperly and wear rapidlyBThe piston will overheat due to insufficient lubricationCExcessive oil will remain on the cylinder wallDLight brown smoke will emanate from the engine exhaust
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Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）Ajam in the most worn part of the cylinder when the rings expandBbreak in the most worn part of the cylinder when the rings expandCwear eccentrically on the side opposite the end gapDoverheat and jam at the top center on the combustion stroke
单选题In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）Awide compression rings are usedBoil rings are located above the pistonCchromium plating is used on all piston ringsDoil rings are located near the bottom of the piston skirt
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Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）Ahas a crown-faceBexceeds wear limits through normal wearChas excessive blow-byDis in good condition
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In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wallAⅠ onlyBⅡ onlyCeither Ⅰ or ⅡDneither Ⅰ or Ⅱ
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Before replacing a piston you should check that all rings are （）.AfreeBfastenedCbrokenDstuck
单选题Scuffed cylinder liner surfaces in a diesel engine can result form（）Astarting the engine hotBknurling the piston skirtCoperating an overheated engineDusing scuff resistant piston rings
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In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）AUsed of bimetallic piston ringsBRing gap pre-tensioningCThermal increase in ring-end clearanceDGas pressure acting against the back of the ring
单选题Either a low injection pressure or a leakage of piston rings is able to lead （）.Aa high exhaust temperatureBa high smoky exhaustCa high outputDa high compression
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Each piston stuffing box is provided with two sealing rings and three（）ApackingsBpiston ringsCdistributor ringsDscraper rings
单选题If the piston ring gap remains insufficient when installing new rings, youshould（）Ainstall oversized ringsBhone the cylinder liner to allow ring installationCcompress the rings tighter with a compressing toolDfile the ends of the rings
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If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）Aexcessive ring actionBexcessive ring temperatureCimproper ring rotationDexcessive ring face wear
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If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）Amicro-seizureBstickingCscratchedDbreakage/ollapse
单选题Around the combustion chamber, all the main components are bore cooled to give low strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）AthermalBmechanicalCplasticDelastic