Fluid Dynamics知到智慧樹章節(jié)測試課后答案2024年秋山東科技大學(xué)

FluidDynamics知到智慧樹章節(jié)測試課后答案2024年秋山東科技大學(xué)第一章單元測試

Afluidcanresistanappliedshearstressbydeforming.（）

A:對B:錯

答案:錯Differencesbetweenasolidandafluidismadeonthebasisofthesubstance’sabilitytoresistandappliedshearstressthattendstochangeitsshape.（）

A:錯B:對

答案:對Fluideventuallystopsdeformingatsomefixedstrainanglewhenaconstantshearforceisapplied.（）

A:對B:錯

答案:錯Thetangentialcomponentofaforceactingonthesurfaceperunitiscalledthenormalstress.（）

A:對B:錯

答案:錯Thehighlyorderedflowsmotionwithsmoothstreamlinesiscalledlaminar.（）

A:錯B:對

答案:對

第二章單元測試

Duetocapillarity,thecasesthatthelevelofthetubewillriseordepressiscalledcapillarityphenomena.（）

A:錯B:對

答案:對Forcapillarityphenomena,whenadhesionisbiggerthancohesion,thetubelevelisdepressed.（）

A:錯B:對

答案:錯Theviscosityofliquidsdecreaseswithtemperature,whereastheviscosityofgasesincreaseswithtemperature.（）

A:錯B:對

答案:對Viscosityrepresentstheinternalresistanceofafluidtomotion,whichisexpressedbySirIsaacNewtonfirstin1687.（）

A:對B:錯

答案:對Theshearstressinfluidisnotproportionaltothemagnitudeofthefluiddeformation.（）

A:錯B:對

答案:錯

第三章單元測試

Thepressureunitpascalistoosmallforpressuresencounteredonpractice.Therefore,it’smultiplieskilopascalarecommonlyused.So1Kpa=pa.（）

A:1000B:100C:10D:10000

答案:1000Usingahydrauliccarjackwithapistonareaof,forexample,apersoncanlifta1000-kgcarbyapplyingaforceofjustkgf.（）

A:10B:100C:1000D:10000

答案:1000Anopentankcontains5.0mofwatercoveredwith1mofoil().Findthegagepressureattheinterfacebetweentheliquids.（）

A:8kpaB:20kpaC:16kpaD:10kpa

答案:16kpaThebuoyantforceonanybodyisequaltotheweightoffluiddisplaced.（）

A:對B:錯

答案:對Forabodyinaliquidwithafreesurface,ifitsweightislessthanthatofthesamevolumeofliquid,itwillriseandfloatonthesurface.（）

A:對B:錯

答案:對

第四章單元測試

Thetimemeansvalueoftheturbulentfluctuationoftheinstantaneousvelocityovertimeequalsto.（）

A:twoB:oneC:zeroD:three

答案:zeroThevelocityofaliquidina150-mmpipelinesis.Calculatetherateofflowin.（）

A:B:C:D:

答案:IntheEuleriandescription,wedon’treallycarewhathappenstoindividualfluidparticles;ratherweareconcernedwiththepressure,velocity,acceleration,etc.,ofwhateverfluidparticlehappenstobeattheinterestlocationandattheinteresttime.（）

A:對B:錯

答案:對Insteadyflow,streamlinesarecoincidentwithpathlinesandstreamlines.（）

A:錯B:對

答案:對

答案:無

第五章單元測試

Thepiezometricheadorthestatic(pressure)headcanbeexpressedas_______inBernoulliequation.（）

A:B:

C:

D:

答案:ThetotalheadinBernoulliequationcanbeexpressedas_____inBernoulliequation.（）

A:B:C:D:

答案:TheelevationheadinBernoulliequationcanbeexpressedas______inBernoulliequation.（）

A:B:C:D:

答案:ThevelocityheadinBernoulliequationcanbeexpressedas_______

inBernoulliequation.（）

A:B:C:D:

答案:Theheadlossinanideal(frictionless)incompressiblefluidisassumedas.（）

A:-1B:1C:1.5D:0

答案:-1

第六章單元測試

Inthemomentumequation,forsteadyflowthenetforceonthefluidmassisequaltothenetrateofoutflowofmomentumacrossthecontrolsurface.（）

A:錯B:對

答案:對Thevectorialmomentumequationcanbealsoexpressedasscalarequationsintermsofforcesandvelocitiesinthedirections,respectively.（）

A:x,yB:x,y,zC:xD:x,z

答案:x,y,zThemomentumcorrectionfactor(

A:4/5B:4/5C:4/3D:3/4

答案:4/3Themomentumprincipledealsonlywithforcesthatactonthefluidmassinadesignatedcontrolvolume(

A:錯B:對

答案:對Themomentumprinciplestatesthatthesumoftheexternalforces

A:錯B:對

答案:對

第七章單元測試

InReynoldexperiment,thecriterionthatdeterminesthewhethertheflowislaminarorturbulentis.（）

A:EulernumberB:ReynoldsnumberC:FroudnumberD:Machnumber

答案:ReynoldsnumberThehydraulicradiusisdefinedastheexpressionaboutthecross-sectionalareaoftheflowingfluidA,andthewettedperimeter.so.（）

A:=A2PB:=A/PC:=AP2D:

答案:=A/PThehydraulicradiusisaconvenientmeansforexpressingtheshapeaswellasthesizeofaconduit,sotherelationshipbetweendiameterDandcanbeexpressesas.（）

A:B:C:D:

答案:Inthestructureoftheturbulence,turbulentisinhibitedsothatalaminar-likesublayeroccursimmediatelynexttothewall.Thissublayeriscalled.（）

A:turbulentsublayerB:laminarsublayerC:inviscidsublayerD:viscoussublayer

答案:viscoussublayerIfthesurfaceroughnessprojectionsarelargeenoughtoprotruderightthroughthetransitionlayer.Theresultingflowiscompletelyturbulent,knownasfullyrough(-pipe)flow（）

A:錯B:對

答案:對

第八章單元測試

Theratioofthelineardimensionsoftheprototypeto,ordividedby,thecorrespondingdimensionsinthemodel.Itfollowsthatareasvaryas.（）

A:B:C:D:

答案:Fortheratiooftheinertiaforcestoviscousforce,theresultingparameteriscalledthe.（）

A:WeberNumberB:MachNumberC:ReynoldnumberD:Froudenumber

答案:ReynoldnumberAdimensionlessquantityrelatedtotheratiooftheinertiaforcestothepressureforcesisknownasthe.（）

A:FroudenumberB:ReynoldnumberC:EulerNumberD:WeberNumber

答案:EulerNumberInthemass-length-