雨课堂学堂在线学堂云《Engineering Mechanics（重庆水利电力职业技术学院）》单元测试考核答案

第1题Aforceactingonarigidbodycanmovetoanypositionontherigidbodyalongitslineofactionanddoesnotchangetheeffectoftheforceontherigidbody;thisphenomenoncharacterizes().AMobilityofforce;BTransmissibilityofforce;CEquivalenceofforce;DMoveabilityofforce;第2题Thethreeelementsofforceare().AMagnitude;BSteering;CDirection;DActionpoint;EActionsurface;正确答案：ACD第3题Forcesystemscanbeclassifiedas()accordingtothedistributionlawsandcharacteristicsoftheforces.APlaneconvergence;BPlaneparallelism;CPlanearbitrary;DPlaneperpendicular;EPlaneorthogonal;正确答案：ABC第4题Thebasicaxiomsofstaticsare().AAxiomofactionandreactionforces;BAxiomoftwo-forceequilibrium;CAxiomofparallelogramofforces;DAxiomofthetriangleofforces;EAxiomoftheadditiveandsubtractiveequilibriumforcesystem;正确答案：ABCE第5题Thethreeelementsoftorqueare().AMagnitude;BSteering;CDirection;DActionpoint;EActionsurface;正确答案：ABE第6题Thethreeelementsofforcecoupleare().AMagnitude;BSteering;CDirection;DActionpoint;EActionsurface;正确答案：ABE第7题Forcesactingonanobjectproducedeformationandmotioneffects.()第8题Thedifferencebetweentheaxiomofactionandreactionforcesandtheaxiomoftwo-forceequilibriumisthedifferenceinthenumberofobjects.()第9题Theaxiomoftwo-forceequilibriumappliesnotonlytorigidbodies,butalsotodeformedbodies.()第10题Thetransmissibilityofforcesappliesonlytorigidbodies.()第11题Theprojectionoftheresultantforceonanycoordinateaxisisequaltothealgebraicsumoftheprojectionsofthecomponentforcesonthesamecoordinateaxis.()第12题Theeffectofforceactingonthemotionofanobjectcanbedividedintothemovementeffectandtherotationeffect.()第13题Thephysicalquantitythatmeasurestheeffectofaforcetorotateanobjectaroundapointistheforcecouple.()第14题Themomentoftheresultantforcetothepointisequaltothealgebraicsumofthemomentsofthecomponentforcestothepoint.()第15题Aforcesystemconsistingoftwoforcesofequalmagnitudeandoppositedirection,actingparallelandnotco-linear,iscalledaforcecouple.()第16题Thepositiveandnegativesignsforbothtorqueandforcecouplearespecifiedaspositiveforinverseandnegativeforforward.()第17题Themagnitudeofthemomentdependsonthemagnitudeoftheforce,notontheforcearm.()第18题Theprojectionoftheforcecoupleonanycoordinateaxisisequaltozero.()第19题Themomentoftheforcecoupletothepointisconstantlyequaltothemomentofitsownforcecouple,independentofthepositionofthemomentcenter.()第20题Themagnitudeoftheforceintheforcecoupleandthelengthoftheforcecouplearmcanbechangedarbitrarilywithoutchangingtheeffectoftheforcecoupleontheobject,aslongasthemagnitudeandsteeringoftheforcecouplemomentarenotchanged.()第1题Thesufficientconditionsfortheequilibriumoftheplaneconfluentforcesystemare:Σx=0andΣy=0.()第2题Thesufficientconditionsfortheequilibriumoftheplaneforcecouplesystemare:Σm=0.()第3题Thesufficientconditionfortheequilibriumofanarbitraryforcesystemintheplaneisthattheprincipalvectorisequaltozeroortheprincipalmomentisequaltozero.()第4题Theforceactingonarigidbodycanbetranslatedtoanypositionoftherigidbody,butaforcecouplemustbeattachedwhosemomentisequaltothemomentoftheoriginalforceonthenewpointofaction.()第5题Inthesystemofobjects,thepartthatcanindependentlymaintainitsownstabilityiscalledtheaccessorypart.()第6题Inasystemofobjects,thepartthatcanonlyrelyonthebasicparttoremainstableiscalledtheaccessorypart.()第7题Inthecalculationofthereactionforceofasystemofobjects,theprincipleofcalculatingthesubsidiaryfirstandthenthebasicmustbefollowed.()task：BasicKnowledgeofMaterialMechanics第1题Inthecross-sectionofarod,thestressdistributedperpendiculartothecross-sectioniscalled().ANegativestressBPositivestressCShearstressDBendingstress第2题Inthecross-sectionofarod,thestressdistributedparalleltothecross-sectioniscalled().ANegativestressBPositivestressCShearstressDBendingstress第3题Thebasicmethodforcalculatingtheinternalforceofarodis().AJointsmethodBCross-sectionalmethodCEquationmethodDDifferentialmethod第4题Whenarodisdeformedinaxialtensionorcompression,themaininternalforcegeneratedbytherodis().AAxialforceBShearforceCBendingmomentDTorque第5题Whenarodisdeformedinpurebending,themaininternalforcegeneratedbytherodis().AAxialforceBShearforceCBendingmomentDTorque第6题Whentherodissubjectedtotwoloadsofequalmagnitude,oppositedirectionandinfinitelyclosetothedirectionoftherodaxis,themaininternalforcegeneratedbytherodis().AAxialforceBShearforceCBendingmomentDTorque第7题Whentherodissubjectedtoaforcecoupleofequalmagnitude,oppositedirectionandintheplaneperpendiculartotherodaxis,themaininternalforcegeneratedbytherodis().AAxialforceBShearforceCBendingmomentDTorque第8题Thebasicassumptionsfordeformedsolidsare().AContinuousuniformityBContinuousnon-uniformityCIsotropicDAnisotropicEMicrodeformation正确答案：ACE第9题Thebasicformsofroddeformationare().AAxialtensilecompressionBShearCTorsionDBendingECreep正确答案：ABCD第10题Thebasictypesofinternalforcesinrodmembersare().AAxialforceBShearforceCMomentDBendingmomentETorque正确答案：ABDE第11题Forthetensileandcompressivedeformationoftherod,theaxialforcethatmakesthememberproducetensiledeformationispositive,andviceversaisnegative.()第12题Forthesheardeformationoftherod,theshearforcethatmakesthememberproducecounterclockwiserotationispositive,andviceversaisnegative.()第13题Forthebendingdeformationoftherod,thebendingmomentthatmakesthememberproducedownconvexdeformationispositive,andviceversaisnegative.()第14题Fortorsionallydeformedrods,thetorquethatmakesthevectorpoint(right-handspiral)inthesamedirectionastheouternormalofthecross-sectionispositive,andviceversaisnegative.()task：AxialTensionandCompression第1题Whichofthefollowingmaterialsisaplasticmaterial?()AConcrete;BCastiron;CMildsteel;DStone.第2题Whichofthefollowingmaterialsisabrittlematerial?()ACopper;BCastiron;CAluminum;DSteel;第3题Thelimitingstressusuallyusedinthedesignofplasticmaterialsis().AProportionallimit;BElasticlimit;CYieldlimit;DStrengthlimit;第4题Theultimatestressusuallyusedinthedesignofbrittlematerialsis().AProportionallimit;BElasticlimit;CYieldlimit;DStrengthlimit;第5题Thestagesthatmildsteelundergoesduringtensiletestingare().AProportionalphase;BElasticphase;CYieldphase;DReinforcementphase;ENeckingphase;正确答案：BCDE第6题Theengineeringproblemssolvedbythepositivestressstrengthconditionsofaxialtensionandcompressionrodsare().AStrengthcheck;BStiffnesscheck;CSectiondesign;DDeterminationofallowablestress;EDeterminationofallowableload;正确答案：ACE第7题Theplasticityindexofthematerialmainlyincludes().AElongation;BShortening;CSectionshrinkage;DSectionexpansion;ESectionelongation;正确答案：AC第8题Forcantileverbeams,itisnotnecessarytocalculatethesupportreactionforcebeforefindingtheinternalforce.()第9题Thepositivestressinthecross-sectionofarodisequaltotheratiooftheaxialforcetothecross-sectionalarea.()第10题Plasticmaterialsrequiremoresafetyreservesinusethanbrittlematerials.()第11题TheconstantsreflectingtheelasticpropertiesofthematerialarePoisson'sratioandelasticitymodulus.()task：PlaneBending第1题ForasimplysupportedbeamwithafullspanbearingauniformloadqspanofL,themaximummomentinthespanis().ABCD第2题ForasimplysupportedbeamofspanLsubjectedtoaconcentratedforceFatadistanceofameterfromsupportAandbmeterfromsupportB,themaximummomentinthebeamis().ABCD第3题Themaximumshearstressinthecrosssectionofarectangularsectionbeamis()timestheaverageshearstressofthesection.A1.0B1.5C2.0D2.5第4题Themaininternalforcesoftheplanebendingbeambodyare().AAxialforceBShearforceCMomentDBendingmomentETorque正确答案：BD第5题Thebasicformsofstaticbeamsare().ASimplysupportedbeamBCantileverbeamCExtendingbeamDBendingbeamECurvedarchbeam正确答案：ABC第6题Theengineeringproblemssolvedbythepositivestressstrengthconditionsofplanebendingbeamare().AStrengthcheckBStiffnesscheckCSectiondesignDDeterminationofallowablestressEDeterminationofallowableload正确答案：ACE第7题Measurestoimprovethebendingstrengthofbeamsare().AReductionofmaximumbendingmomentBReductionofmaximumshearforceCSelectionofreasonablecross-sectionsDUseofvariable-sectionbeamsEUseofequal-sectionbeams正确答案：ACD第8题Measurestoimprovethebendingstiffnessofbeamsare().AIncreasingtheflexuralstiffnessBReducingthespanofthebeamCReducingthemaximumbendingmomentDReducingthemaximumshearforceEincreasingthenumberofbearings正确答案：ABCD第9题Thesuperpositionmethodofplanebendingismainlyapplicabletothecalculationofbendingmoment.()第10题Onthebeamsectionwithoutloadaction,thesheardiagramisadiagonalstraightlineandthebendingmomentdiagramisahorizontalline.()第11题Theshearforcediagramishorizontalandthebendingmomentdiagramisquadraticparaboliconthebeamsegmentwithuniformload.()第12题Onthebeamsectionwithuniformload,thereareextremevaluesofbendingmomentatthesectionwheretheshearforceiszero.()第13题Onthebeamsectionwithconcentratedloads,thebendingmomentdiagramisunaffectedandthesheardiagramhasabruptchanges,thevalueofwhichisequaltothemagnitudeoftheconcentratedforce.()第14题Onthebeamsectionwithforcecoupleaction,thesheardiagramisunaffectedandthebendingmomentdiagramhasabruptchanges,thevalueofwhichisequaltothemagnitudeoftheforcecouplemoment.()第15题Indrawingthemomentdiagram,theessenceofthesuperpositionmethodisthegeometriccollocationofthemomentdiagramgeneratedbyeachload.()第16题Apurebendingbeamreferstoabeamwithonlybendingmomentsandnoshearforcesineachcrosssectionofthebeamsection.()task：CombinedDeformation第1题Inthecalculationofthemaximumtensilestressinanysectionofanobliquelybentbeam,itisnecessarytoconsidernotonlythebendingmomentproducedinthesectionbythecomponentforceoftheobliqueforceintheverticalaxis,butalsothebendingmomentproducedinthesectionbythecomponentforceoftheobliqueforceinthehorizontalaxis.()第2题Inthecalculationofthemaximumcompressivestressinanysectionofaneccentricallycompressedrod,theconcentratedforceneedstobetranslatedtotherodaxis,atwhichtimenotonlythepositivestressproducedbytheforceonthesection,butalsothepositivestressproducedbytheforcecoupleinthecenteroftheoriginalmostsectiononthesectionneedstobeconsidered.()第3题Thecross-sectionalcoreisaregionofthecross-sectionofatensileorcompressiverodthatappearsinthesamestateoftensionorcompressionunderaneccentricload.()第4题Forafullysymmetricalrodsection,thecoreofthesectionisusuallyinaregionthatspreadstoacertainextentcenteredonthesection'sformcenter.()task：StabilityofthePressureLever第1题Foraslendercompressionrodhingedatbothends,thecriticalloadcalculationformulais().ABCD第2题Foroneendfixed,oneendfreeslendercompressionrod,thecriticalloadcalculationformulais().ABCD第3题Foroneendfixed,oneendhingedslendercompressionrod,thecriticalloadcalculationformulais().ABCD第4题Foraslendercompressionrodfixedatbothends,thecriticalloadcalculationformulais().ABCD第5题TheEuler'scriticalstressformulaforaslendercompressionrodis().ABCD第6题Forthemediumflexibilitycompressionrod,thecriticalstressempiricalformulais().ABCD第7题Formetalcompressionrods,thestabilitysafetyfactorisgenerallytakenas().A1.5-3.0B1.6-3.0C1.7-3.0D1.8-3.0第8题Thebasicmethodforcalculatingthepressurebarstabilityare().AReductionfactormethodBSafetyfactormethodCIterativemethodDInterpolationmethodETrialmethod正确答案：AB第9题Measurestoimprovethestabilityofthecompressionrodare().AReducingthelengthofthecompressionrodBSelectingareasonablesectionCStrengtheningtherodendrestraintDrationalselectionofmaterialsEincreasingthecriticalload正确答案：ABCD第10题Theessenceofpressrodstabilityistheabilityofthepressurelevertomaintainitsoriginallinearequilibriumstate.()第11题Thepressurelevercanbebalancedinastraightstate,andwhendisturbed,itcanbebalancedinaslightlybentstate.Thisstateiscalledthecriticalstateofthepressurelever.()第12题Whetherthepressureleverisdestabilizedornotdependsmainlyonwhetherthepressurereachesthemaximumloadvalue.()第13题Thestrongerthesupportattheendsoftheslenderpressurelever,thesmallerthelengthfactorwillbe.()第14题Thecriticalstressofaslenderpressureleverisproportionaltothesquareoftheflexibility,andthegreatertheflexibility,thegreaterthecriticalstress.()第15题TheEuler'scriticalstressformulaisapplicabletothecasewherethecriticalstressofthepressureleverdoesnotexceedtheelasticlimitofthematerial.()task：BasicKnowledgeofStructuralMechanics第1题Thenumberofrestrainedreactionsoffixedhingesupportsis().A1B2C3D4第2题Thenumberofrestrainedreactionsofmovablehingesupportis().A1B2C3D4第3题Thenumberofrestrainedreactionsoffixedendsupportsis().A1B2C3D4第4题Thenumberofrestrainedreactionsofdirectionalhingesupportis().A1B2C3D4第5题Thenumberofconstraintsforthehingejointis().A1B2C3D4第6题Thenumberofconstraintsfortherigidjointis().A1B2C3D4第7题Therodsystemstructurethatgenerateshorizontalthrustfromthesupportwhensubjectedtoverticalloadis().ABeamBArchCRigidframeDTruss第8题Intheplane,thenumberofdegreesoffreedomofpointis().A1B2C3D4第9题Intheplane,thenumberofdegreesoffreedomofrigidsheetis().A1B2C3D4第10题Intherestraintdevice,onechainlinkisequivalentto()restraints.A1B2C3D4第11题Inarestraintdevice,thehingelinkingtworigidsheetsiscalled().ALinkconstraintBSinglehingeconstraintCCompoundhingeconstraintDImaginaryhingeconstraint第12题Inarestraintdevice,ahingelinkingthreeormorerigidsheetsiscalled().ALinkconstraintBSinglehingeconstraintCCompoundhingeconstraintDImaginaryhingeconstraint第13题Iftherearetwofixedendbearingsateachendofasingle-spansimplysupportedbeam,thenumberoftimesthesimplysupportedbeamissuper-stationaryis().A1B2C3D4第14题Inthemechanicalsketch,thesimplificationsare().AStructureBJointsCSupportsDLoadsEProperties正确答案：ABCD第15题Thebasictypesofplanerodsystemsare().ABeamBArchCRigidframeDTrussETimberframe正确答案：ABCD第16题Intherealengineeringconstructionprocess,theconnectionformsthatcanbeconsideredasrigidjointsare().AReinforcingsteeltyingBComponentweldingCStructuralcastingDBoltedconnectingEPinningconnecting正确答案：BCD第17题Thebasictypesofjointsarehingejointsandrigidjoints.()第18题Thefixedendsupportistorestricttheobjectfrommovinghorizontallyandvertically,butnottorestricttheobjectfromrotating.()第19题Iftworigidsheetsareconnectedbyalinkthatintersectsanimaginaryhinge,thetwosheetswillrotaterelativetoeachotheraroundtheimaginaryhingeundertheactionofexternalforces.()第20题Ifthetworigidsheetsareconnectedbythreelinksthatarenotexactlyparallelnorexactlyintersectingatonepoint,thestructureformedisageometricallyinvariantsystem.()第21题Ifthetworigidsheetsareconnectedbythreelinksintersectingatarealpoint,thestructureformedisageometricallytransientsystem.()第22题Ifthetworigidsheetsareconnectedbythreelinksintersectingatanimaginarypoint,thestructureformedisageometricallytransientsystem.()第23题Ifthetworigidsheetsareconnectedbythreeparallelandequal-lengthlinks,thestructureformedisageometricallytransientsystem.()第24题Ifthetworigidsheetsareconnectedbythreeparallelandunequallinks,thestructureformedisageometricallytransientsystem.()第25题Ifthethreerigidsheetsareconnectedbythreehingesthatarenotco-linear,thestructureformedisageometricallyinvariantsystem.()第26题Ifthethreerigidsheetsareconnectedbythreeco-linearhinges,thestructureformedisageometricallyconstantsystem.()第27题Onlygeometricallyinvariantsystemscanbeusedinengineering.()task：InternalForceCalculationofStaticallyDeterminateStructure第1题Themaininternalforcesofthetrussare().AAxialforceBShearforceCBendingmomentDTorque第2题Theconnectionformofthetrussmembernodesis().AHingepointBRigidpointCRigidhingepointDCombinednode第3题Commonstaticallydeterminatestructuresare().AMulti-spanstaticallydeterminatebeamBArchCRigidframeDTrussECombinedstructure正确答案：ABCDE第4题Thereare()methodsforcalculatingtheinternalforcesoftrusses.ANodemethodBSectionmethodCRoutemethodDDifferentiationmethodEInternalandexternalmethod正确答案：AB第5题Thethree-hingedarchisastaticallydeterminatestructure.()第6题Thetwo-hingedarchisastaticallydeterminatestructure.()第7题Ahingelessarchisastaticallyindeterminatestructure.()第8题Thecantileverrigidframedoesnotneedtocalculatethesupportreactionforcewhencalculatingtheinternalforce.()第9题Formulti-spanstaticallyindeterminatebeams,theorderofbasicandthensubsidiaryshouldbefollowedwhencalculatingthesupportreactionforce.()task：DisplacementCalculationofStaticallyDeterminateStructur第1题Forbeamsandrigidframes,themostimportantfactorcausingdisplacementis().AAxialforceB