第1題Thehydraulictransmissionsystemiscomposedofthefollowingparts,whichare____,____and____,____and____.正確答案：:powerelement正確答案：:executionelement正確答案：:controlelement正確答案：:auxiliaryelement正確答案：:workingmedium第2題Thehydraulicpowerelementconvertthe____to____.正確答案：:mechanicalpower正確答案：:hydraulicpower第3題Theexecutionelementconvertthe____to____.正確答案：:hydraulicpower正確答案：:mechanicalpower第4題Hydraulicpumpisatypical____inhydraulicsystem.正確答案：:powerelement第5題Hydrauliccylinderisatypical____inhydraulicsystem.正確答案：:powerelement第6題Hydrauliccylinderoutputs____.正確答案：:linearmovement第7題Hydraulicmotoroutputs____.正確答案：:rotationalmovement第8題Hydrauliccontrolelementregulatethe____、____and____ofthehydraulicoil.正確答案：:pressure正確答案：:flowrate正確答案：:flowdirection第9題Hydraulictransmissionisof____efficiency.正確答案：:low第10題Hydraulictransmissionis____tobeprotectedfromoverload.正確答案：:low第11題Whichofthefollowingisnotanadvantageofthehydraulicsystem()AWiththesamesizestructure,thehydraulicsystemcandelivergreaterpowerBSmallinertia,rapidstartingandbraking,smoothmovementCConvenientforsteplessspeedregulation,widespeedregulationrangeDHighertransmissionefficiency第12題Whichofthefollowingisnotadisadvantageofthehydraulicsystem()ACannotbeusedforhighprecisiontransmissionBOverloadprotectionisnoteasytoachieveCHighprecisionrequirementsforcomponentmanufacturingDDifficultyintroubleshooting第13題Whichofthefollowingisahydraulicpowerelement()APumpBMotorCCylinderDReliefvalve第14題Whichofthefollowingisahydrauliccontrolelement()APumpBMotorCCylinderDReliefvalve第15題Whichofthefollowingisarotationalhydraulicexecuteelement()APumpBMotorCCylinderDReliefvalve第16題Hydraulicsystemcannotbeusedforhighprecisiontransmission.()第17題Withthesamesizestructure,thehydraulicsystemcandelivergreaterpower.()第18題Thehydraulicsystemhashighprecisionrequirementsforcomponentmanufacturing.()第19題Itisdifficultintroubleshootingofhydraulicsystem.()第20題第21題第22題第1題Liquidisacontinuousmedium.Thatis,themotionparametersofliquidcanberegardedasacontinuousfunctionof(),anditispossibletouseanalyticalmathematicstodescribeitsmotionlaw.AIthasnothingtodowithtimeandspaceBTimeandspaceCJusttimeDJustspace第2題Inthecaseof(),theinfluenceofliquidcompressibilityonperformancesofhydraulicsystemcannotbeignored.AWhenstudyingstaticperformancesofsystemBWhenstudyingdynamicperformancesofsystemCUnderhighpressureDUnderlowpressure第3題()hasagreatinfluenceonthecompressibilityofliquid.AGasmixedwithliquidBImpuritiesmixedintoliquidCTheviscosityofliquidDDensityofliquid第4題Thehydrostaticpressureisalwaysalongthe()directionofliquidactingsurface.ATangentBOuternormalCNotsureDInnernormal第5題Therelationshipbetweenrelativepressure,absolutepressureandatmosphericpressureis().ARelativepressure=absolutepressure+atmosphericpressureBAbsolutepressure=relativepressure-atmosphericpressureCAtmosphericpressure=absolutepressure+relativepressureDRelativepressure=absolutepressure-atmosphericpressure第6題Acurveofthemotionstateofvariousparticlesinliquidflowatatimeiscalled().ATraceBWaterlineCQualitylineDStreamline第7題Sinceanymasspointintheflowingliquidcanonlyhaveonespeedatacertaintime,thereis()betweenthestreamlines.AImpossibletointersect,maymakeasuddenturnBItisimpossibletointersect,anditisimpossibletomakeasuddenturnCItmayintersect,butitisimpossibletomakeasuddenturnDMayintersect,orsuddenlyturn第8題Thevelocityoftheactualliquidontheflowsection().AEachpointisdifferent,showingaparabolicdistributionBThepointsaredifferent,distributedinatriangleCEachpointisdifferentandthedistributionlawisuncertainDAllpointsarethesame第9題Whenliquidflows,theparticleshavenolateralpulsationanddonotinterferewitheachother.Thehierarchicalflowstatethatisorientedandnotmixediscalled().ATurbulenceBLaminarflowCAdvectionDTurbulence第10題Theenergylossofliquidintheequal-diameterstraightpipealongtheflowdirectionduetotheinternalfrictionbetweenthefluidlayersiscalled().AFlowlossBPressurelossCEnergylossalongthewayDLocalenergyloss第11題Whichofthefollowingcharacteristicsdoesliquidhave:()AHomogeneityBContinuityCNottensileDEasyflow正確答案：ABCD第12題Themainfunctionoftheworkingmediuminthehydraulicsystemis:()ALubricateBTransferenergyCTakeawaydirtDTakeawayheat正確答案：ABCD第13題Thecommonlyusedformsofpressureunitsare:()AForceperunitareaBMultipleofengineeringatmosphericpressureCForceperunitvolumeDLiquidcolumnheight正確答案：ABD第14題Whetherliquidislaminarorturbulentisrelatedto().AFlowrateBViscosityofliquidCDensityDPipediameter正確答案：ABD第15題Localenergylosswilloccurunderthefollowingconditions().ATheflowsectionissuddenlyenlargedBTherearevarioushydrauliccomponentsandaccessoriesintheflowchannelCTheflowsectionissuddenlyreducedDTheflowchannelisbent正確答案：ABCD第16題第17題Homework-chapter3第1題Liquidisacontinuousmedium.Thatis,themotionparametersofliquidcanberegardedasacontinuousfunctionof(),anditispossibletouseanalyticalmathematicstodescribeitsmotionlaw.AIthasnothingtodowithtimeandspaceBTimeandspaceCJusttimeDJustspace第2題Inthecaseof(),theinfluenceofliquidcompressibilityonperformancesofhydraulicsystemcannotbeignored.AWhenstudyingstaticperformancesofsystemBWhenstudyingdynamicperformancesofsystemCUnderhighpressureDUnderlowpressure第3題Inhydraulictransmissiontechnology,thestaticpressurecausedbyexternalforceismuchlargerthanthestaticpressurecausedbygravity,sothelattercanusuallybeignored.()第4題Whenliquidflowsinaroundpipe,thevelocitydistributionintheturbulentflowstateismoreuniformthanthatinthelaminarflowstate.()第5題Accordingtothedifferentcauses,gapflowcanbedividedintothreetypes:differentialpressureflow,shearflowand____flow.正確答案：:mixing第6題ThelargeReynoldsnumbershowsthattheinertialforceplaysaleadingrole,andliquidflowisin____state.正確答案：:Turbulence第7題第8題第9題第10題第11題第12題第13題第14題Homework-chapter4第1題____areactuatorcomponentsofahydraulicsystem,whichconverthydraulicpressureenergyintomechanicalenergytodrivetheexternalloadtomoveinalinearmotion.正確答案：:Hydrauliccylinder第2題____isthetotaldistancethatthecylindercanmove.正確答案：:Stroke第3題Forthepistoncylinder,therearesinglerodand____types,whichmeanstheycanperformsingleactionordoubleaction.正確答案：:doublerod第4題Whilefortheplungercylinder,therearesingleplungerand____.正確答案：:doubleplunger第5題Hydrauliccylindersaredividedintofourgroups,pistoncylinder,plungercylinder,____and____.正確答案：:swingcylinder正確答案：:combinedcylinder第6題Fordouble-actingsingle-rodcylinders,theeffectiveareasoftwochambersofsinglerodcylinderare____,andthevolumesoftwochambersare____.正確答案：:unequal正確答案：:different第7題Conventionaldouble-actingcylindersarethemostcommonhydraulicactuatorsbecausetheyareespeciallycontrollableandcandevelopbothcompressiveand____.正確答案：:tensileforces第8題Aplungercylindercanonlybeusedasa____cylinder;themaximumforceispistonrodareamultipliedbypressure.正確答案：:pushing第9題Forthedouble-rodcylinder,thediameteroftherodateachsideofthepistonisthe____,andthevolumesoftwochambersarethe____.正確答案：:same正確答案：:same第10題Forthesingleroddoubleactioncylinder,withareaA1,A2,pressurep1andp2,thethrustforceF1onthepistonis____.正確答案：:F1=p1A1-p2A2第11題Thebarrelisclosedononeendbythecylinderbottom(alsocalledthecap),whichhastowithstandshockloadsattheextremeendsofpistontravel.WhichoneisthebarrelshowninFig.4.1()AABBCCDDFig.4.1hydrauliccylinder第12題Hydrauliccylinderisoffivebasicparts:twoendcaps,portconnections,barrel,andtherod,whichoneistheconnectionportinFig.4.1.()AABBCCDD第13題Whenthecylinderisretracted,contaminantsofthelikesofdirt,moistureandcorrosivematerialsmaybedrawnbackintothebarrel,causingproblemsinsidethecylinder,cylindersarefittedwitha()toremovesurfacedustandcontaminants.AendcapBwipersealandbellowsCpistonsealDbarrel第14題Inordertopreventtheleakageoffluidonthehigh-pressuresidealongtherod,aninternalsealingringisfittedbehindthebearing,whichoneisthesealingringinFig.4.1()AABBCCDDA:Ahydrauliccylinderhastomoveatableofweight13kN.Speedofthecylinderistobeaccelerateduptoavelocityof0.13m/sin0.5seconds.Assumecoefficientofslidingfrictionas0.15andcylinderborediameteras50mm.第15題BasedonthedescriptioninA,whatistheaccelerationofthecylinder()A0.06m/s2B0.16m/s2C0.26m/s2D0.5m/s2第16題BasedonthedescriptioninA,whatistherequiredforcetomovethecylinder()A2000NB2294NC2395ND3000N第17題Toovercomethisforcein6.,thepressurerequiredinthehydrauliccylinderis()A10.52barB11.69barC25.69barD12.53barB.WiththeconditioninA,thecylinderwasbroughttostopwithinadistanceof0.02m.第18題Fromtheequationforvelocityanddistance,whatisthedeceleration()A-0.42m/s2B0.26m/s2C0.52m/s2D0.47m/s2第19題Whatishydraulicpressurecreatedbythisopposingforce()A12.1barB12.7barC9.5barD13.8bar第20題Forexcavatorapplication,singlerodcylinderismostsuitabletypeforboom,armandbucketaction.()第21題Inconstructionmachineapplication,i.e.,forklift,crane,excavator,doublerodcylindersaremostsuitabletypesforboom,armandbucketaction.()第22題Comparedwiththesinglerodhydrauliccylinder,differentialconnectioncylinderisaneffectivemethodofreducingthrustandincreasingspeed.()第23題Swingcylinderisatypeofswingmotor.()第24題Basedontherequiredtorque(inN)andassumingaknownpumppressure(inPa),wecandecideontheareaofthepiston(inm2).()第25題Basedontheareadecidedin6aboveandbasedontherequirespeed,therequiredflowfromthepumpcanbedecided.()第26題CombinationofSingleroddoubleactioncylinderwithchainmechanismcanbeusedtoreplacedtelescopiccylinderintelescopicapplication.()第27題Plundercylinderislikedoubleactionsinglerodcylinder,whichisretractedbyhydraulicoil.()第28題Differentialconnectioncylinderisusedforslowspeedapplication.()第29題第30題第31題第32題第33題第34題第35題第36題第37題Homework-chapter5第1題Instructure,allhydrauliccontrolvalvesconsistof____,____(spool,coneorball)and____usedtocontrolthevalvecore.正確答案：:thevalvebody正確答案：:thevalvecore正確答案：:theoperatingelements第2題Mostvalvesperformthreeprimaryfunctionsinthehydraulicsystem:tocontroltheoilpressure——____,theflowrate——____andthedirectionofoilflow____inthesystemtoensuretheactuatorsinproperworkingonordertheloadrequested.正確答案：:pressurecontrolvalves正確答案：:flowcontrolvalves正確答案：:directionalcontrolvalves第3題Therearetwotypesofgeneraldirectionalcontrolvalves:____and____正確答案：:in-linecheck正確答案：:directionalcontrolvalves第4題____aredevicesinstalledinacircuittomakeitcertainthatthesystempressuredoesnotexceedsafetylimits.正確答案：:Reliefvalves第5題____areusedtodropthenormaloperatingpressureofamaincircuit.正確答案：:Pressure-reducingvalves第6題____isusedtodirecttheflowoffluidtomorethanonepartofacircuitinsequence.正確答案：:Asequencevalve第7題____areusedtocontroltheflowratebychangingtheorificeflowarea.正確答案：:Theflowcontrolvalves第8題____isanelementthatswitchesthepressureinthehydraulicsystemtoanelectricsign.正確答案：:Pressurerelay第9題____functionsasanelectro-hydraulictransferequipmentandalsoapoweramplifier.正確答案：:Anelectro-hydraulicservovalve第10題Whichofthefollowinghydrauliccontrolvalvesbelongstopressurecontrolvalve().AUnloadingvalveBoverflowthrottlevalveCHydrauliccontrolcheckvalveDLowpressureselectorvalve第11題Therearetworeliefvalveswithregulatingpressuresof5MPaand10MPainseriesattheoutletofthehydraulicpump,andtheoutletpressureofthepumpis();parallelconnectedtotheoutletofthehydraulicpump,theoutletpressureofthepumpis().A5MPaB10MPaC15MPaD20MPa正確答案：CA第12題Inordertoensurethatthepressuredifferencebetweenthefrontandrearofthethrottlevalveremainsunchangedwhentheloadchanges,theflowthroughthethrottlevalveisbasicallyunchanged.Thethrottlevalveisoftenconnectedwith()toformaspeedcontrolvalve,orthethrottlevalveand()areconnectedinparalleltoformabypassspeedcontrolvalve.APressurereducingvalveBconstantpressurereducingvalveCoverflowvalveDdifferentialpressurereliefvalve正確答案：BD第13題Inhydraulictransmission,thehydrauliccontrolvalveusedtocontrolthepressure,flowanddirectionofliquidis().APowerplantBcontrolunitCauxiliarydeviceDActuator第14題Thecommonlyusedpressurecontrolvalveinhydraulictransmissionsystemis()AdirectionalvalveBreliefvalveChydrauliccontrolcheckvalve第15題WhenthecontroloilportKofthehydrauliccontrolcheckvalveisblockedfromthepressureoil,theforwardandreverseoilcanpassfreely.()第16題hehydrauliccontrolone-wayvalveisonintheforwarddirectionandcutoffinthereversedirection.()第17題Motorizeddirectionalvalveisusedinstrokecontrol.()第18題Directactingreliefvalveisoftenusedasthepilotvalveofsafetyvalveorotherpilotreliefvalve.()第19題Whenthereliefvalveisusedasaconstantpressurevalve,itisconnectedtotheoutletofthehydraulicpumptoensurethattheoutletpressureofthehydraulicsystem()isconstant.()第20題Sequencevalvecanbeusedasreliefvalve.()第21題Intheremotepressureregulatingcircuitusingtheremotepressureregulatingvalve,onlywhenthesettingpressureofthereliefvalveishigherthanthatoftheremotepressureregulatingvalve,theremotepressureregulatingvalvecanstartthepressureregulatingoperation.()第22題Whentheoiloutletofthehydrauliccontrolsequencevalveisconnectedwiththeoiltank,itbecomestheunloadingvalve.()第23題Thefunctionofbackpressurevalveistomakethereturnoilchamberofhydrauliccylinderhavecertainpressuretoensurethesmoothoperationofmovingparts.()第24題Thedirectionalvalveisrealizedbychangingtherelativepositionofthevalvecoreinthevalvebody.()第25題第26題第27題Homework-chapter6第1題____isadeviceforenergystorageandreleaseinthehydraulictransmissionsystem.正確答案：:Accumulator第2題____keepthehydraulicfluidcontaminantfree,purifyhydraulicoilandcontrolwithinthedesirablerange.正確答案：:Hydraulicfilters第3題Thetypesoffiltermediaarecommonlydividedinto____,linegaptypefilter,papercoretypefilterandsinteredtypefilter.正確答案：:meshtypefilter第4題____locatedbeforethehydraulicpump,thesefiltersaredesignedtoprotectthepumpfromharmfulcontaminantsthatarewithinthehydraulicfluid.正確答案：:Suctionsidefilters第5題____locateddownstreamfromthehydraulicpump,thesefiltersaredesignedtocleanthefluid.正確答案：:Pressuresidefilters第6題____storesthehydraulicoiltoensureadequateworkinghydraulicoilforhydraulictransmissionsystem.正確答案：:Reservoir第7題Inthefollowingchoice,whicharethetypicaltypesofaccumulators?()AWeightloadedaccumulatorBSpringloadedaccumulatorCGaschargedaccumulator正確答案：ABC第8題Asmallhydraulicaccumulatorcandoareliablejobwhenit’smatchedtothepropersystem.Whatarethemajorpurposesforusingaccumulator()ASmoothingoutOperationsBAbsorbingPulsationsCControllingLoadsDSofteningNoise正確答案：ABCD第9題.Whichofthefollowingapplicationswouldrequireanonbypassingtypefilter?()AReturnlinefilterBDownstreamofanyfixeddisplacementpumpCUpstreamofaservovalveDInaseparatefilteringandcoolingcircuit第10題Thesymbolshownbelowindicates()AHydraulicaccumulatorBFilterCHeaterDCooler第11題Whenusinganaccumulatorforshockitshouldbe:()AinstalledasfaraspossibleawayfromthecomponentitprotectsBpre-chargedapproximately1000PSIabovethemaximumsystemworkingpressureConegallonorsmallerinsizeDmountedhorizontally第12題Whenusingahydraulicaccumulatorforvolumeandtheaccumulatorisoperatingproperly,heatshouldbefelt:()AallovertheaccumulatorshellBinthelower1/2-2/3oftheshellCatthebottomoftheshellonlyDatthedumpvalveonly第13題Whattypegasshouldnormallybeusedtochargeanaccumulator?()AOxygenBCompressedairCNitrogenDAcetylene第14題Filterisnotnecessaryinthehydraulicsystem.()第15題InthenortheastofChina,thehydraulicsystemdonotneedtoinstallcooler,becausetheenvironmentistoocoldthere.()第16題Forcoldenvironment,heaterisnecessaryforhydraulicsystem.()第17題Inthereservoir,drainpugisnecessaryforflowingoutwaterforlongtermusing()第18題Theairbreatherandfilterabovethereservoirisusedtobalancetheairpressure.()第19題Suitabletemperatureofhydraulicsystemisrangedfrom30to50℃()第20題Thuscoolerisessentialforhightemperatureenvironment,andheaterforlowtemperatureenvironment.()第21題Water-cooledoilcoolerscanbeusedinhigh-pressureapplicationssuchasthosefoundinoilrefineriesandchemicalprocessingplants.()第22題Steelpipes,copperpipes,stainlesssteelpipes,andrubberhosesareusedinpipingforhydraulicequipment.()第23題Copperpipesarenotusedincommonpracticebecauseitacceleratesoxidationofpetroleum-basedhydraulicfluids.()第24題第25題第26題第27題Homework-chapter7第1題Adifferentialconnectioncylindercircuit,()ofthecylinderincrease。AforceBpressureCspeedDflowrate第2題Theinputoiltemperatureis()intheinletspeed-regulatingcircuit。AhighBlowCnochange第3題Thepressure-unloadingcircuitisusedfor()。AreducinglossofpowerBIncreasinglossofpowerCimprovingtheheatofthesystem第4題Thefixeddeliverypumpandvariabledeliverymotorvolumespeed-regulatingcircuitcanbecalled()。ATheconstanttorquespeed-regulatingcircuitBTheconstantpowerspeed-regulatingcircuitCnochange第5題Adifferentialconnectioncylindercircuit,thevelocityoftherodis()。ABCD第6題Thehydrauliccircuitcancontroltheparameterofthesystemwithout()。AflowrateBpressureCspeedDDirection第7題The()andthefixedpumpconsistofone-stagepresssureregulatedcircuit。ANon-returnvalveBpressurereducingvalveCReliefvalveDThrottlevalve第8題Inordertopreventverticalhydrauliccylindersandcomponentsassociatedfromdecliningduetodeadweight,()isapplied。Apressurecounter-balancecircuitBpressureregulatedcircuitCpressure-reducingcircuit第9題Inordertocontrolthesequencemovementofseveralactuators,()isnotapplied。AsequencevalveBpressurerelayClimitswitchDcylinder第10題Whentheactuatorcontactstheloadandbeginstoworkinthefast-speedmovementcircuitbydoublepumpprovingpressurizedoil,whichpumpisworking?()AThesmallpumpBThelargepumpCBothofAandB第11題Speedcontrolcircuitsareusedtocontrolandregulateactuatorspeedandpressure。()第12題Thethrottlespeed-regulatingcircuitshavebeenusedwidelyinmachinetoolswithhigh-pressureandhigh-powersystems。()第13題Thevolumespeed-regulatingcircuitissuitableforapplacationinhighspeedcircuit。()第14題Fast-speedmovementcircuitbyadifferentialconnectioncylindercanincreasetheforce。()第15題Fast-speedmovementcircuitbydoublepumpprovidingpressurizedoilcansignificantlyreducepowerlossesandimproveefficiency。()第16題Thehydrauliccylindercanbelockedbyhydraulicoperatednonreturnvalve。()第17題Thehydrauliccylindercanbelockedatanypositionwhenthethree-positionandfour-waychangevalveisinHtypeneutralconditon,ifthedirectionalvalveconnectwiththecylinder。()第18題Themulti-actuatorscontrolcircuitsisusedtocontrolsynchronousmovementofseveralactuators。()第19題Thedirectionalcircuitwiththestrokechangevalvecancontrolthetwocylinderssequentialmovements,andchangingthesequenceofactioniseasy。()第20題Thepressure-reducingcircuitcanchangethepressureofthemainsystem。()第21題Thebasichydrauliccircuitsinclude____circuits、____circuits、____circuits、and____circuits。正確答案：:speedcontrol正確答案：:pressurecontrol正確答案：:directionalcontrol正確答案：:multi-actuatorcontrol第22題Speedcontrolcircuitsinclude____circuits、____circuitsand____circuits。正確答案：:speed-regulating正確答案：:fast-speedmovement正確答案：:speedshift第23題Basedonthedifferentadjustmentmethods,speedcontrolcircuitsdividedinto____circuits、____circuitsand____circuits。正確答案：:throttlespeed-regulating正確答案：:volumespeed-regulating正確答案：:volume-throttlespeed-regulating第24題Accordingtodifferentinstallationpositionsofthethrottlevalve,thethrottlespeed-regulatingcircuitsdividedinto____circuit、____circuitand____circuit。正確答案：:inletthrottlespeed-regulating正確答案：:outletspeed-regulating正確答案：:bypassthrottlespeed-regulating第25題Basedonthecombinationofthepumpwiththecylinderorthemotor,therearefourtypesofvolumespeed-regulatingcircuits,including____、____、____and____。正確答案：:variabledeliverypumpandthehydrauliccylinder正確答案：:variabledeliverypumpandthefixeddeliverymotor正確答案：:thefixeddeliverypumpandthevariabledeliverymotor正確答案：:thevariabledeliverypumpandthevariabledeliverymotor第26題Thedirectionalcontrolcircuitisusedtocontroltheactuatorof____、____or____flowdirectionofpressurizedoil。正確答案：:operating正確答案：:stopping正確答案：:shifting第27題Thepressurecontrolcircuitsinclude____circuits、____circuits、____circuits、____circuits、____circuitsand____circuits。正確答案：:pressureregulated正確答案：:pressure-unloading正確答案：:pressure-holding正確答案：:pressure-reducing正確答案：:supercharging正確答案：:pressurecounter-balance第28題Pressureregulatedcircuitsdividedinto____pressureregulatedcircuitand____pressureregulatedcircuit。正確答案：:one-stage正確答案：:multistage第29題Thesequenceactioncircuitcontrolledby____、____、____。正確答案：:sequencevalve正確答案：:pressurerelay正確答案：:limitswitchandsolenoidchangevalve第30題Pressure-reducingcircuitsdividedinto____pressure-reducingcircuitand____pressure-reducingcircuit。正確答案：:one-stage正確答案：:two-stage第31題第32題Homework-chapter8第1題Whenthehydraulictransmissionsystemneedhighpressure,whichpumpwillbeselected。()AGearpumpBVanepumpCPistonpump第2題Theareaofinputportisbiggerthantheareaofoutportinexternalpump,themainreasonis()。ADecreasingtheoutputhydraulicpressureBDecreasingoilleakageCincreasingcapacityofoilabsorptionDReleasingthesurroundedhydraulicoil第3題Thepressure-unloadingcircuitisusedfor()。AIncreasinglossofpowerBreducinglossofpowerCimprovingtheheatofthesystem第4題Theviscosityofhydraulicwill()whenthetemperatureisincreasing。AincreaseBdecreaseCnochange第5題Basedonthecombinationofthepumpwiththecylinderorthemotor,theconstanttorquespeed-regulatingcircuitis()。AvariabledeliverypumpandthehydrauliccylinderBvariabledeliverypumpandthefixeddeliverymotorCthefixeddeliverypumpandthevariabledeliverymotorDthevariabledeliverypumpandthevariabledeliverymotor第6題Accordingtodifferentinstallationpositionsofthethrottlevalve,thehighestefficiencyofthecircuitsis()。Ainletthrottlespeed-regulatingcircuitBoutletspeed-regulatingcircuitCbypassthrottlespeed-regulatingcircuit第7題The()andthefixedpumpconsistofone-stagepressureregulatedcircuit。AReliefvalveBPressurereducingvalveCNon-returnvalveDThrottlevalve第8題Thereservoirhasfunctionofcooling,storingand()。AHeatingBEnergystorageCReleasingEnergy第9題()canconvertmechanicalenergyintohydraulicpressureenergy。AHydrauliccylinderormotorBHydraulicpumpsCHydraulicvalvesDmotor第10題5.Adifferentialconnectioncylindercircuit,theoutputforceofthecylinderis()。ABCD第11題Accordingtodifferentequipment,differentdesignspecificationsanddesignstandardsmustbeselected。()第12題Wecanbegintodraftahydraulictransmissionsystemdiagramwithoutthedesignrequirements。()第13題Weselectthehydrauliccomponentsonthesakeofeconomybasedonthemainparameters。()第14題Afterconfirmingthehydraulictransmissionsystem,thesystemefficiencyandheatwouldnotneedtobeestimated。()第15題Thetechnicaldocumentsincludedesignspecification,theworkingprincipleofthesystemandtheinstructionsmanual,andsoon。()第16題Theoneadvantageofhydraulictransmissionsystemisthatthehydraulicoilleakageisinevitable。()第17題Thefaultofthehydraulictransmissionsystemcanbeeasytofind。()第18題Weclassifyhydraulicpumpsintogear,vaneandpistonpumps。()第19題Vanemotoronlyhasthedouble-actingtypeandisusedforthevariabledeliverymotor。()第20題TheAccumulatorisadeviceforstorageinthehydraulictransmissionsystem。()第21題Theapproachforthedesignofatypicalhydraulictransmissionsystemisshownas(____)、(____)、(____)、(____)、(____)、(____)。正確答案：:confirmthedesignrequirements正確答案：:draftadiagramofahydraulictransmissionsystem正確答案：:calculatethemainparameters正確答案：:selectthehydrauliccomponents正確答案：:estimatetheperformance正確答案：:drawworkingdrawingandcomposethetechnicaldocuments第22題Themainparametersofthehydraulictransmissionsystemare(____)and(____)。正確答案：:p正確答案：:Q第23題Thepressureofthehydraulictransmissionsystemneedtobecalculatedby(____)。正確答案：:theloadendured第24題Theworkingdrawingsinclude(____)、(____)、(____)and(____)。正確答案：:thehydraulictransmissiondiagram正確答案：:thehydrauliccomponentslayout正確答案：:pumpassemblydrawing正確答案：:pipingassemblydrawing第25題Atypicalhydraulictransmissionsystemconsistoffivecomponentssuchas(____)、(____)、(____)、(____)、(____)。正確答案：:energycomponent正確答案：:actuatorcomponents正確答案：:controlcomponents正確答案：:auxiliarycomponents正確答案：:workinghydraulicoil第26題Speedcontrolcircuitsinclude(____)circuits、(____)circuitsand(____)circuits。正確答案：:speed-regulating正確答案：:fast-speedmovement正確答案：:speedshift第27題Theauxiliarycomponentsinclude(____)、(____)、(____)、(____)、(____)etc。正確答案：:accumulators正確答案：:filters正確答案：:reservoirs正確答案：:pipingandsealdevices正確答案：:pressuregauge第28題Inahydraulictransmissionsystemtypicaloperatingmodesincludemanualoperation、(____)、(____)、(____)andelectro-hydraulicoperation。正確答案：:mechanicaloperation正確答案：:solenoidoperation正確答案：:hydraulicoperation第29題Theproportionalpressurevalveconsistof(____)and(____)。正確答案：:proportionalsolenoid正確答案：:pressurevalve第30題Thespeed-regulatingvalveisacombinationvalveconsistingof(____)and(____)inaseriesconnection。正確答案：:fixeddifferentialpressure-reducingvalv