雨课堂学堂在线学堂云《Fundamentals of machine design（重庆工业职业技术学院）》单元测试考核答案

第1题Themanufacturingunitinamechanismiscalledacomponent.()第2题Fromastructuralandkinematicperspective,amachineismerelyageneraltermformechanisms.()第3题Themaincharacteristicsofamachineare:acombinationofvarioushuman-madephysicalobjects,definiterelativemotionbetweentheobjects,andtheabilitytoperformusefulmechanicalworkorachieveenergyconversion.()第4题Amechanismisthesmallestmanufacturingunitthatmakesupamachine.()第5题Acomponentreferstothebasicmotionunitofamechanism.()第6题Amachinecanbeasinglepartorarigidassemblyofseveralparts.()第7题Whenstudyingthemotionlawsofmechanisms,partsandassembliesarecollectivelyreferredtoascomponents.()第8题Fromastructuralandkinematicperspective,thereisnodistinctionbetweenmachinesandmechanisms.Amachinecanconsistofoneormultiplemechanisms.()第9题Thecomponentsofamachineormechanismcanbeclassifiedbytheirmotioncharacteristicsintofixedcomponents,drivingcomponents,anddrivencomponents.()第10题Machinesandmechanismsarecollectivelyreferredtoasmachinery.()第1题Inakinematicpair,ahigherpairispointcontact,andalowerpairislinecontact.()第2题Whenanalyzingthedegreesoffreedomofamechanism,theframehasonedegreeoffreedom.()第3题Eachindependentcomponentmakingplanarmotionhastwodegreesoffreedom.()第4题Dependingonthetypeofconnectionbetweentwocomponents,kinematicpairsareclassifiedintolowerpairsandhigherpairs.()第5题Therestrictionsappliedtoindependentmotionarecalledconstraints.()第6题Whencalculatingthedegreesoffreedomofamechanism,attentionshouldbepaidtocompoundjoints,localdegreesoffreedom,andredundantconstraints.()第7题Asimplediagramthatillustratesthecompositionofaplanarmechanismandtherealmotionrelationshipsbetweenitscomponentsiscalledaplanarmechanismkinematicdiagram.()第8题Whenthetotalnumberofcomponentsformingacompoundhingeisk,thenumberofrevolutepairsincludedatthatpointshouldbe____。AkBk+1Ck-1D1第9题Acomponentundergoingarbitrarymotioninaplanehas____degreesoffreedom.A1B2C3D4第10题Introducingalowerpairtoacomponentundergoingarbitrarymotioninaplanewillreducethenumberofdegreesoffreedomby____。A1B2C3D4Task3第1题Theswingingrodmechanismalwaysexhibitsquickreturncharacteristics.()第2题Duringtheoperationofamechanism,thepressureanglevaries.()第3题Inplanarlinkagemechanisms,thecomplementaryangleofthepressureangleiscalledthetransmissionangle.()第4题Inplanarlinkagemechanisms,thelargertheextremepositionangleθandtheKvalue,themorepronouncedthequickreturnmotioncharacteristic.()第5题Whetheramechanismhasadeadpointpositionisunrelatedtowhichcomponentischosenasthedrivingmember.()第6题Allplanarfour-barmechanismshaveacrank.()第7题Theformofafour-barlinkagemechanismcanonlybechangedbyselectingdifferentcomponentsasthefixedframe.()第8题Inafour-barlinkagemechanism,thecouplerthatcanmakeafullrotationiscalledarocker.()第9题Inafour-barlinkagemechanism,thecouplerthatcanmakeafullrotationiscalledacrank.()第10题Inacrank-rockermechanism,thelargerthepressureangle,thebettertheforcetransmissionperformance.()第11题Amongthefollowingfour-barlinkagemechanisms,theonethatcanachievequickreturnmotionis____.ADoublerockermechanismBCrank-rockermechanismCDoublecrankmechanismDNoneoftheabove第12题Inacrank-rockermechanism,theextremepositionsoftherockeroccurwhenitisinthe____position.AWhenthecrankandcouplerarecollinearBWhenthecrankandframearecollinearCWhenthecouplerandrockerarecollinearDWhentherockerandframearecollinear第13题Inacrank-rockermechanism,whenthedrivingcrankrotatesataconstantspeed,thedrivenrockeroscillatesatanunequalspeed.Thisphenomenoniscalledthe____ofthemechanism.ADeadpointphenomenonBMotionuncertaintyCQuickreturncharacteristicDStrokevariationTask4第1题Inacammechanism,ifthefollowerfollowsacosineaccelerationmotionlaw,thereisarigidimpactinthemechanism.()第2题Accordingtotheshapeofthecam,camscanbemainlyclassifiedintothreetypes:diskcams,translatingcams,andcylindricalcams.()第3题Accordingtotheshapeofthefollowerinthecammechanism,followerscanbemainlyclassifiedintothreetypes:pointedfollowers,rollerfollowers,andflatfollowers.()第4题Accordingtothemotionformofthefollowerinthecammechanism,followerscanbemainlyclassifiedintotwotypes:translatingfollowersandoscillatingfollowers.()第5题Thebasecircleofacamisacircledrawnwiththesmallestradiusofthetheoreticalcamprofilecurve.()第6题Inacammechanismwherethefollowermovesataconstantspeed,thedisplacementdiagramisahorizontalline,andthevelocitydiagramisalsoahorizontalline.()第7题Thefollowersincammechanismsarealwaysreciprocating.()第8题Thebasecircleradiusofadiskcamisthesmallestradialdistancefromthetheoreticalprofilecurvetothecenterofrotationofthecam.()第9题In____cammechanisms,formorecomplexcamprofiles,therequiredmotionlawcanalsobeaccuratelyachieved.APointedfollowerBRollerfollowerCFlatfollowerDAnytypeoffollower第10题Therelationshipbetweenthepressureangleofthecamandthebasecircleradiusis____.AThesmallerthebasecircleradius,thesmallerthepressureangleBThelargerthebasecircleradius,thesmallerthepressureangleCThesmallerthebasecircleradius,thelargerthepressureangleDThelargerthebasecircleradius,thelargerthepressureangleTask5第1题Thesimplestratchetmechanismgenerallyconsistsofaratchetwheel,apawl,andaframe.()第2题TheGenevadriveconsistsofadrivingwheelwithapin,adrivenwheelwithseveralradialslots,andaframe.()第3题Intermittentmotionmechanismscanconvertthecontinuousmotionofthedrivingmemberintointermittentmotionofthedrivenmember.()第4题Ratchetmechanismsandslider-crankmechanismsareintermittentmotionmechanisms.()第5题Thepitchdiameterofathreadisthenominaldiameterofthethread.()第6题Accordingtothedirectionofthethreadhelix,threadscanbeclassifiedintoleft-handthreadsandright-handthreads.()第7题Iftheinternalthreadisleft-hand,thenthematchingexternalthreadshouldberight-hand.()第8题Themainreasonforusingratchetmechanismsinliftingmachineryisthatratchetmechanismscanpreventtheweightfromfalling.()第9题Thethreadsuitableforconnectionsis____.ATrapezoidalthreadBButtressthreadCSquarethreadDTriangularthread第10题Thefollowingmechanismthatisnotanintermittentmotionmechanismis____.ARatchetmechanismBGenevadriveCSlider-crankmechanismDIncompletegearmechanism第11题Themainpurposeofusingaretainingpawlinaratchetmechanismisto____.APreventtheratchetwheelfromreversingBEnsuretheratchetwheelrotatesthesameangleeachtimeCDrivetheratchetwheelDIncreasethelifespanoftheratchetwheelTask6第1题Thepressureanglesatallpointsontheinvoluteprofileareequal.()第2题Thecorrectmeshingconditionforstraightbevelgearsisthatthemoduleandpressureangleatthelargeendareequal.()第3题Forapairofmeshingstraightspurgearswithinvoluteprofiles,thecontactpointstracetheexternalcommontangentofthebasecirclesofthetwogears.()第4题Geartransmissionscanbeclassifiedbasedontheworkingenvironmentintoenclosedgeartransmissions,opengeartransmissions,andsemi-enclosedgeartransmissions.()第5题Geartransmissionscanbeclassifiedbasedontherelativepositionsofthegearaxesintoparallelaxiscylindricalgeartransmission,intersectingaxisbevelgeartransmission,andskewaxisgeartransmission.()第6题Theconditionforcontinuoustransmissionofstandardinvolutestraightspurgearsisthatthecontactratiois≥1.()第7题Theminimumnumberofteethforastandardstraightspurgeartoavoidundercuttingis14.()第8题Whenmachininginvolutestraightspurgearsusingthegeneratingmethod,undercuttingoccursifthecutter'saddendumlineexceedsthetheoreticallimitofthemeshingline.()第9题Forstandardinvolutegears,theshapeofthegeartoothprofileisinfluencedbythesizeofthebasecircle.()第10题Generallyspeaking,straightgeartransmissionhasbetterstabilitythanhelicalgeartransmission.()第11题Themainfailuremodesofopengeartransmissionare____.APlasticdeformationofgearteethBPittingofthetoothsurfaceCWearofthetoothsurfaceandbreakageofgearteethDAdhesionofthetoothsurface第12题Forgearswiththesamenumberofteeth,asthemoduleincreases,thegeometricdimensionsandload-carryingcapacityofthegear____.ADecreaseBIncreaseCDonotchangeDCannotbedetermined第13题Forstandardinvolutegears,thefactoraffectingtheshapeofthegeartoothprofileis____.AThebasecircleradiusofthegearBThepitchcircleradiusofthegearCTheaddendumcircleradiusofthegearDTheradiusofanyarbitrarycircleofthegear第14题Forapairofstandardstraightspurgearswithamoduleof2mmandtoothnumbersof20and30,thecenterdistanceofthegeartransmissionis____.A100mmB200mmC50mmD25mmTask7第1题Agearmechanismcomposedofseveralpairsofgearsiscalledageartrain.()第2题Geartrainscanbeclassifiedintospurgeartrainsanddifferentialgeartrainsbasedonwhetherthegeometricaxesofthegearsarefixed.()第3题Inafixed-axisgeartrain,therotationalaxisofeachgearisfixed.()第4题Anidlergeardoesnotaffectthegearratiobutcanchangethedirectionofthedrivengear.()第5题Ifonegearaxisisnotfixed,thegeartrainiscalledaplanetarygeartrain.()第6题Inapairofgears,theratioofthespeedsofthetwogearsiscalledthegearratio.()第7题Combiningfixed-axisgeartrainsandplanetarygeartrainsiscalledaplanetarygeartrain.()第8题Geartrainscanachievelargergearratios.()第9题Thedegreeoffreedomofadifferentialgeartrainis2.()第10题Theratioofthenumberofteethbetweentwogearsinagearpairiscalledthegearratioofthegeartransmission.()第11题Ageartrainwithadegreeoffreedomof1is____.AdifferentialgeartrainBplanetarygeartrainCcompoundgeartrainDfixed-axisgeartrain第12题Thecharacteristicofaplanetarygeartrainis____.AItsgearratiocanbedirectlycalculatedfromtheoriginalgeartrainBAtleastonegeartoothprofileinthegeartrainisnotfixedCItsgearratioisconstantDAllgearaxesarefixedTask8第1题Slipinbelttransmissionisanormalphenomenonandcannotbeeliminated.()第2题Inbelttransmission,duetothetensiondifferencebetweenthetightsideandtheslackside,thebeltundergoeselasticsliponthepulley,whichcanbeavoided.()第3题Whenthediametersoftwopulleysareconstant,reducingthecenterdistancewillincreasethewrapangleofthesmallerpulley.()第4题Synchronoustoothedbeltsmainlytransmitmotionandpowerthroughmeshingbetweenteethandtoothgroovesonthepulleys,withoutslipbetweenthebeltandthepulleys,hencethetransmissionratioisconstant.()第5题TheincludedangleαbetweentheworkingsurfacesoftheV-beltiscalledthebelt'swedgeangle.()第6题Thepurposeofbelttensioningistogivethebeltacertaininitialtension.()第7题OrdinaryV-beltsworkbasedontheirbottomsurface.()第8题Thenumberoflinksinachaindriveshouldnotusuallybeanevennumber.()第9题Theaveragetransmissionratioofachaindriveisconstant.()第10题Chaindrivescanbeusedunderlow-speedheavyloadandharshworkingconditions.()第11题TheselectionofV-belttypemainlydependson____.AThepowertransmissionandthespeedofthesmallpulleyBBeltlinearspeedCTightsidebelttensionDSlacksidebelttension第12题Belttransmissionrelieson____totransmitmotionandpower.AFrictionbetweenthebeltandthebottomsurfaceofthepulleyBFrictionbetweenthebeltandthesidesurfaceofthepulleyCTightsidebelttensionDSlacksidebelttension第13题Thewrapangleofthechainonthesmallsprocketshouldgenerallybegreaterthan____.A90°B120°C150°D180°第14题Comparedwithgeartransmission,theadvantagesofchaintransmissionare____.AHightransmissionefficiencyBSmoothoperationwithnonoiseCHighload-carryingcapacityDAbilitytotransmitoverlongercenterdistancesTask9第1题Ashaftthatbearsbothbendingmomentandtorsioniscalledarotatingshaft.()第2题Ashaftthatonlybearsbendingmomentiscalledatransmissionshaft.()第3题Thepartoftheshaftthatfitswiththebearingiscalledthejournal,anditsdiametershouldmatchthebearing'sinnerdiameterstandard.()第4题Tofacilitateassembly,theendsofjournalsandshaftheadsshouldbechamfered.()第5题Thepartconnectingthejournalandtheshaftheadiscalledtheshaftbody.()第6题Thefinaldiametersandlengthsofthevarioussectionsoftheshaftcanbedeterminedwithoutaxialpositioningandfixingofthepartsontheshaft.()第7题Thetwosidefacesofaflatkeyareworkingsurfaces,andthereisnogapbetweenthetopsurfaceandthebottomofthehubslot.()第8题Aslidingkeyisgenerallyfixedtothehubandmoveswiththehubalongthekeywayontheshaft.()第9题Awedgekeyconnectionisusedforstaticconnections,andthetopandbottomsurfacesofthewedgekeyareworkingsurfaces.()第10题Lockingwashersareaformofmechanicallocking.()第11题Whichofthefollowingisnotacommonlyusedmethodforfixingpartsonashaft?____.AShaftcollarandshoulderBSleeveCRoundnutandlockingwasherDFlatkey第12题Keyconnections,pinconnections,andthreadedconnectionsallbelongto____.ADetachableconnectionsBNon-detachableconnectionsCWeldingDNoneoftheaboveTask10第1题Bearingscanbeclassifiedintorollingbearingsandslidingbearings.()第2题Thebasicstructureofarollingbearingconsistsoftheinnerring,outerring,bearingbush,andcage.()第3题Accordingtothemainloaddirectiontheybear,rollingbearingscanbeclassifiedintoradialbearings,thrustbearings,andradial-thrustbearings.()第4题Angularcontactballbearingscansimultaneouslybearradialandaxialloads.()第5题Deepgrooveballbearingscanonlybearradialloads.()第6题Thetotalworkinghoursofabearingataconstantspeediscalledthebearing'slifespan.()第7题Thetypecodeforangularcontactballbearingsis6.()第8题Thestructureofradialslidingbearingsmainlyincludesintegral,split,andself-aligningtypes.()第9题Themainfailuremodeofnon-liquidfriction