機電專業(yè)英語復(fù)習(xí)題及答案

機電專業(yè)英語期末復(fù)習(xí)試題一．選擇題1.Ifallpointsinalinkagemoveinparallelplanesthesystemundergoesplanarmotionandthelinkagemaybedescribedasa______.A.planarmotionB.planarlinkageC.jointsD.slide2.Thoughframematerialanddesignshouldhandledamping,_____aresometimesbuiltintoframesectionstohandlespecificproblems.A.beamsB.holesC.dampersD.screw3.Themaximumallowabledeflectionofashaft______determinedbycriticalspeed,gear,orbearingrequirements.A.oftenB.mustC.wasD.isusually4.Wewillhaveto_____tobetterandbettersolutionsaswegeneratemoreinformation.A.repeatmanytimesB.iteratingC.iterateD.tryways5.Ifaproductconfigurationis_______specifiedandthenexaminedtodeterminewhethertheperformancerequirementsaremet.A.finallyB.tentativelyC.temporaryD.havebeen6.Manufacturingcanbedefinedasthe_____ofrawmaterialsintousefulproductsthroughtheuseoftheeasiestandlest-expensivemethods.A.transformationB.processingC.processD.transforming7.Theplanerandkneetypesofmillingmachineis_____becauseofitsflexibility.A.usedmostcommonlyB.mostpopularC.themostcommonlyusedD.mostpowerful8.Asaresult,thesystemwillvibrateatthefrequencyofthe_____forceregardlessoftheinitialconditionsornaturalfrequencyofthesystem.A.actionB.excitationC.outD.act9.Beforetwocomponentsareassembledtogether,therelationshipbetweenthedimensionsofthematingsurfaces_______.A.mustbegivingoutB.shouldprintedclearlyC.mustbespecifiedD.shouldbeclearlynoted10.Themainpracticaladvantageoflowerpairsistheirbetterabilitytotraplubricantbetweentheir______surfaces.A.envelopingB.matingC.outerD.outside11.Theword______itselfusuallyreferstothedeteriorationofmetalsandceramics,whilesimilarphenomenainplasticsgenerallycalled______.A.recrystallization….corrosionB.recrystallization…degradationC.degradation…corrosionD.corrosion…degradation12.Mostframes_______castiron,weldsteel,composition,orconcrete.A.aremadefromB.aremadeupofC.wasproducedbyD.wasconsistof13.Rotatingshaftsparticularlythosethatrunathighspeeds,mustbedesignedtoavoidoperationat______speeds.A.lowB.overloadC.criticalD.hollow14.Althoughcastironisafairlycheapmaterial,eachcastingrequiresa______。A.patternB.modelC.moldD.patent15.Theterm______isusedtodescribejointswithsurfacecontact,aswithapinsurroundedbyahole.A.highpairB.lowpairC.surfacepairD.rotarypair1-5：BCDCB6-10：ACBCA11-15DACAB二．閱讀1.Lassiewasabigdog.Shewasveryclever.Shewasalwayshelpingsomeone.Oncesomebadmentooksomemoneyfromanoldman.Theytiedhimupwitharopeandlefthimonthefloor.TheykeptLassieinanotherroom.Lassietriedtoopenthedooroftheroom.Butecouldn’t.Therewasalargewindowintheroom,butitwastoohighforLassietoreach.Shepulledachairovertowindowandstoodonit.Shepushedandpulledandpulledatthewindowandatlastgotitopen.Withagreatjump,shegotout.Lassiecamebackintothehouseandfoundtheroomwheretheoldmanwasleft.Sheuntiedtheroperoundtheoldman’sarmsandlegs.Thenshehelpedhimoutofthehouseanddowntheroadtothenearesthouse.()1.Lassiewas______.A.ababyB.acatC.adogD.agirl()2.Oncesomebadmentoolsomemoneyfrom______.A.ayoungmanB.ayoungwomanC.anoldwomanD.anoldman()3.Lassie______thedooroftheroom.didn’topenB.openedC.shutD.didn’tshut()4.______untiedtheoldman.A.AgirlB.AcatC.AwomanD.Lassie()5.______caughtthebadmen.A.ThedogB.LassieC.ThepolicemenD.Thegirl2.Mr.Georgeworksattheschoollostandfound.Heworksverycarefully.Everyday,whenhegetsalostthing,hetakesnotesaboutit.Therearepens,books,schooluniforms,keys,walkmansamanyotherthingsinthelostandfound.Mostofthemarethestudents’.Ifyouloseyourthings,it’seasyforyoutogotothelostandfoundforhelp.ButyoumusttellMr.Georgewhatitisandolorandthedaywhenyoucan’tfindit.IthinkMr.Georgeisveryhelpful,andyouwillbehappywhenyoufindthelostthere.()6.Whoworksattheschoollostandfound?A.Mr.BrownB.Mr.KingC.Mr.GeorgeD.Nobody()7.Thereare________thingsinthelostandfound.A.noB.fewC.afewD.many()8.MostthingsMr.Georgetakescareofarethe________.A.boys’B.girls’C.students’D.teachers’()9.Ifyouloseyourthings,you’dbettergotoask________.A.BenB.Mr.GeorgeC.yourteacherD.yourparents()10.Ifyouloseyourthingsandgotothelostandfoundforhelp,youneedn’tellMr.George________.A.WhatitisB.howmuchitisC.itscolorD.thedaywhenyoulostit.3.Thestudentswerehavingtheirchemistry（化學(xué)）class.MissLiwastellingthechildrenwhatwaterwaslike.Afterthat，sheaskedherstudents，"What’swater？”Noonespokeforafewminutes．MissLiaskedagain，“Whydon’tyouanswermyquestion？Didn’tItellyouwhatwaterislike？”Justthenaboyputuphishandandsaid，“MissLi，youtoldusthatwaterhasnocolourandnosmell．Butwheretofindsuchkindofwater？Thewaterintheriverbehindmyhouseisalwaysblackandithasabadsmell．”Mostofthechildrenagreedwithhim．“I’msorry，children．”saidtheteacher，“Ourwaterisgettingdirtieranddirtier．That’saproblem．()11.Thestudentswerehavingtheir_______class．A．EnglishB．ChineseC．chemistryD．maths()12．MissLiwastellingthechildrenwhat______waslike．A．waterB．a(chǎn)irC．earthD．weather()13．Aboysaid，”Thewaterintheriverbehindmyhouseisalways_______．”A．whiteB．blackC．cleanD．clear()14．Mostofthechildren_______theboy．A．a(chǎn)greedwithB．wrotetoC．heardfromD．sentfor()15．Thewaterintheriverhascolourandsmellbecauseitisgetting_______．A．moreandmoreB．lessandlessC．cleanerandcleanerD．dirtieranddirtier1-5:CDADC6-10:CDCBB11-15:CABAD4.Workingdrawingsarethecompletesetofstandardizeddrawingsspecifyingthemanufactureandassemblyofaproductbasedonitsdesign.Thecomplexityofthedesigndeterminesthenumberandtypesofdrawings.Workingdrawingsmaybeonmorethanonesheetandmaycontainwritteninstructionscalledspecifications.Workingdrawingsareblueprintsusedformanufacturingproducts.Therefore,thesetofdrawingsmust:(a)completelydescribetheparts,bothvisuallyanddimensionally;(b)showthepartsiassembly;(3)identifyalltheparts;and(4)specifystandardparts.Thegraphicsandtextinformanmustbesufficientlycompleteandaccuratetomanufactureandassembletheproductwithouterror.Generally,acompletesetofWorkingdrawingsforanassemblyincludes:Detaildrawingsofeachnonstandardparts.Anassemblyorsubassemblydrawingshowingallthestandardandnonstandardpartsinasingledrawing.Abillofmaterials(BOM).Atitleblock.Adetaildrawingisadimensioned,multiviewdrawingofasinglepart,describingthepart’sshape,size,material,andsurfaceroughness,insufficientdetailfortheparttobemanufacturedbasethedrawingalone.Detaildrawingsareproducedfromdesignsketchesorextractedfrom3-Dcomputermodels.TheyadherestrictlytoANSIstandardsandthestandardforthespecificcompany,frdimensioning,assigningpartnumbers,notes,tolerances,etc.Inanassembly,standardpartssuchasthreadedfastenersandbearingsarenotdrawnasdetails,areshownintheassemblyview.Standardpartsarenotdrawnasdetailsbecausetheyarenormallypurchased,notmanufactured,forassembly.Forlargeassembliesorassembledwithlargeparts,detailsaredrawnonmultiplesheets,andasaratesheetisusedfortheassemblyview.Iftheassemblyissimpleorthepartsaresmall,detaawingsforeachpartofanassemblycanbeplacedonasinglesheet.Multipledetailsonasheetareusuallydrawnatthesamescale.Ifdifferentscalesareused,theclearlymarkedundereachdetail.Also,whenmorethanonedetailisplacedonasheet,thespangbetweendetailsiscarefullyplanned,includingleavingsufficientroomfordimensionsandnots.1.Basedonthemessage,whichofthefollowiswrong?standardpartsneedn’tdrawnasdetailsforsimpleparts,sometimesneedn’todrawthedetailworkingdrawingforlargeassembliesdetailsmaydrawnonmultiplesheetsIfdifferentscalesusedinasinglesheet,theyshouldclearlymarkedundereachdetail2.WorkingdrawingsforanassemblyMAYNOTincludes:?A)BOMB)titleblockC)AnassemblyorsubassemblydrawingD)Detaildrawingsofallparts.3.Fordetaildrawing,Whichoneofthefollowingstatementisnottrue?shouldnothasdifferentscalesDetaildrawingcanproducedfromdesignsketchesorextractedfrom3-Dcomputermodels.detaildrawingisadimensioned,multiviewdrawingofasinglepartshouldAdherestrictlytoANSIstandards4.FromthemessagewecaninferANSIis______?A)asetoflawB)asetofnotificationC)anOrganizationD)IEEEgovernment5.Thetopicofthemessageis______?A)Howtodesignworkingdrawings.workingdrawing’scharacterandthekeyinfluenceofhowtodrawaworkingdrawingInthedesignprocess,whatshouldbeconsidered?WhatisworkingdrawingBCACD5.Oneprincipleaimofkinematicsistocreate(design)thedesiredmotionsofthesubjects’mechanicalpartsandthenmathematicallycomputethepositions,velocities,andaccelerations,whichthewillcreateontheparts.Since,formostearthboundmechanicalsystems,themassremainsesseniallyconstantwithtime,definingtheaccelerationsasafunctionoftimethenalsodefinesthemicforcesasafunctionoftime.Stresses,inturn,willbeafunctionofbothappliedandinerta)forces.Sinceengineeringdesignischargedwithcreatingsystemswhichwillnotfailduringtrexpectedservicelife,thegoalistokeepstresseswithinacceptablelimitsforthematerialsandtheenvironmentalconditionsencountered.Thisobviouslyrequiresthatallsystemforcesbeefinedandkeptwithindesiredlimits.Inmachinery,thelargestforcesencounteredareoftenthoduetothedynamicsofthemachineitself.Thesedynamicforcesareproportionaltoacceleration,whichbringsusbacktokinematics,thefoundationofmechanicaldesign.Verybasicandearlydecisioninthedesignprocessinvolvingkinematicprinciplescanbecrucialtothesuccessofanymhanicaldesign;adesignwhichhaspoorkinematicswillprovetroublesomeandperformbadly.Anymechanicalsystemcanbeclassifiedaccordingtothenumberofdegreeoffreedom(DOF)whichitprocesses.Thesystem’sDOFisequaltothenumberofindependentparameterswhichareneededtouniquelydefineitspositioninspaceatanyinstantoftime.Arigidbodyfreetomovewithinareferenceframewill,inthegeneralcase,hascomplexmotion,whichisasimultaneouscombinationofrotationandtranslation.Inthree-dimensionalspace,thermayberotationaboutanyaxisandalsosimultaneoustranslationwhichcanberesolvedintocomponentsalongthreeaxes.Inaplane,ortwo-dimensionalspace,complexmotionbecomesacombinationofsimultaneousrotationaboutoneaxis(perpendiculartotheplane)andalsotranslationrvedintocomponentsalongtwoaxesintheplane1、KinematicsresearchfocusonthefollowingEXCEPT______..A)accelerationsB)forceC)positions,D)velocities2、Fromthepassagethatforthedesignengineerthefirstandmostimportantis____A)theservicelifeofamachineB)thematerialschooseC)thedegreeoffreedomD)maticprinciples3、Anmechanicalsystemhasuniquelydefinedpositioninspaceatanyinstantoftimethat___.A)ItshouldhasoneDOFB)ItshouldHastwoDOFC)theDOFandthenumberofindependentparametersshouldequalD)ItshouldhasanyDOFaswant4、whichoneofthefollowingisNOTTRUE_______?.Arigidbodyfreetomoveinthree-dimensionalspacemayrotationaboutanyaxisArigidbodyfreetomoveinthree-dimensionalspaceisasimultaneouscombinationofrotationandtranslationArigidbodyfreetomoveinthree-dimensionalspacecanberesolvedintocomponentsalongthreeaxesArigidbodyfreetomoveinthree-dimensionalspacemayhascomplexmotion5、Thebesttitleforthispassa