单选题A single piece（） fitted with bronze rings guides the piston in the cylinder liner.Apiston skirtBpiston crownCguide wayDcross-head
单选题
A single piece（） fitted with bronze rings guides the piston in the cylinder liner.
A
piston skirt
B
piston crown
C
guide way
D
cross-head
参考解析
解析：
暂无解析
相关考题：
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
What is acceptable flame screening ________．A.A fitted single brass screen of 10 x 10 meshB.A fitted stainless steel screen of 30 x 30 meshC.A fitted single stainless steel screen of 15 x 15 meshD.Two fitted brass screens of 10 x 15 mesh spaced 1/2 inch apart
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The piston rings are manufactured with a diameter （） the bore of the cylinder.Alarger thanBsmaller thanCequal toDnone of the above
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Improperly fitted piston rings in a diesel engine can cause（）Aexcessive lube oil consumptionBlower than normal lube oil temperatureChigher than normal exhaust back pressureDexcessive crankshaft end play
单选题Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）Aresidual carbon depositsBlube oil viscosity breakdownCuneven heat expansion of the ringsDuneven heat expansion of the piston
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 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To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.Alantern ringsBbearingsCeasing volutesDwearing 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The piston rings if found worn out （） and supplied by shipchandler.Amust replaceBmust to be equippedChas to be repairedDhave to be renewed
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The lower end of each piston rod is reduced in diameter to fit a bore in （）.Athe crossheadBthe journals of the crossheadCthe crosshead shoesDthe guides
单选题All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner during （） for new piston rings.Athe running-in periodBthe running processCgas exchange processDthe boiler firing
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Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.AdeflectionBdiscrepancyCerrorDtolerance
单选题Before replacing a piston you should check the rings to see that all clearances and gaps are （） the permissible tolerances.AaboveBatCoverDwithin
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