Fluid Dynamics智慧树知到答案2024年山东科技大学

FluidDynamics山东科技大学智慧树知到答案2024年第一章测试

Afluidcanresistanappliedshearstressbydeforming.（）

A:对B:错

答案:BDifferencesbetweenasolidandafluidismadeonthebasisofthesubstance’sabilitytoresistandappliedshearstressthattendstochangeitsshape.（）

A:对B:错

答案:AFluideventuallystopsdeformingatsomefixedstrainanglewhenaconstantshearforceisapplied.（）

A:对B:错

答案:BThetangentialcomponentofaforceactingonthesurfaceperunitiscalledthenormalstress.（）

A:对B:错

答案:BThehighlyorderedflowsmotionwithsmoothstreamlinesiscalledlaminar.（）

A:对B:错

答案:A

第二章测试

Duetocapillarity,thecasesthatthelevelofthetubewillriseordepressiscalledcapillarityphenomena.（）

A:对B:错

答案:AForcapillarityphenomena,whenadhesionisbiggerthancohesion,thetubelevelisdepressed.（）

A:对B:错

答案:BTheviscosityofliquidsdecreaseswithtemperature,whereastheviscosityofgasesincreaseswithtemperature.（）

A:对B:错

答案:AViscosityrepresentstheinternalresistanceofafluidtomotion,whichisexpressedbySirIsaacNewtonfirstin1687.（）

A:对B:错

答案:ATheshearstressinfluidisnotproportionaltothemagnitudeofthefluiddeformation.（）

A:错B:对

答案:A

第三章测试

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

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

答案:AUsingahydrauliccarjackwithapistonareaof,forexample,apersoncanlifta1000-kgcarbyapplyingaforceofjustkgf.（）

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

答案:DAnopentankcontains5.0mofwatercoveredwith1mofoil().Findthegagepressureattheinterfacebetweentheliquids.（）

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

答案:BThebuoyantforceonanybodyisequaltotheweightoffluiddisplaced.（）

A:错B:对

答案:BForabodyinaliquidwithafreesurface,ifitsweightislessthanthatofthesamevolumeofliquid,itwillriseandfloatonthesurface.（）

A:错B:对

答案:B

第四章测试

Thetimemeansvalueoftheturbulentfluctuationoftheinstantaneousvelocityovertimeequalsto.（）

A:oneB:twoC:zeroD:three

答案:CThevelocityofaliquidina150-mmpipelinesis.Calculatetherateofflowin.（）

A:B:C:D:

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

A:错B:对

答案:BInsteadyflow,streamlinesarecoincidentwithpathlinesandstreamlines.（）

A:对B:错

答案:A

第五章测试

Thepiezometricheadorthestatic(pressure)headcanbeexpressedas_______inBernoulliequation.（）

A:

B:C:D:

答案:BThetotalheadinBernoulliequationcanbeexpressedas_____inBernoulliequation.（）

A:B:C:D:

答案:ATheelevationheadinBernoulliequationcanbeexpressedas______inBernoulliequation.（）

A:B:C:D:

答案:BThevelocityheadinBernoulliequationcanbeexpressedas_______

inBernoulliequation.（）

A:B:C:D:

答案:DTheheadlossinanideal(frictionless)incompressiblefluidisassumedas.（）

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

答案:D

第六章测试

Inthemomentumequation,forsteadyflowthenetforceonthefluidmassisequaltothenetrateofoutflowofmomentumacrossthecontrolsurface.（）

A:错B:对

答案:BThevectorialmomentumequationcanbealsoexpressedasscalarequationsintermsofforcesandvelocitiesinthedirections,respectively.（）

A:xB:x,yC:x,zD:x,y,z

答案:DThemomentumcorrectionfactor(

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

答案:AThemomentumprincipledealsonlywithforcesthatactonthefluidmassinadesignatedcontrolvolume(

A:对B:错

答案:AThemomentumprinciplestatesthatthesumoftheexternalforces

A:错B:对

答案:B

第七章测试

InReynoldexperiment,thecriterionthatdeterminesthewhethertheflowislaminarorturbulentis.（）

A:EulernumberB:FroudnumberC:ReynoldsnumberD:Machnumber

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

A:=A2PB:=AP2C:D:=A/P

答案:DThehydraulicradiusisaconvenientmeansforexpressingtheshapeaswellasthesizeofaconduit,sotherelationshipbetweendiameterDandcanbeexpressesas.（）

A:B:C:D:

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

A:inviscidsublayerB:turbulentsublayerC:viscoussublayerD:laminarsublayer

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

A:错B:对

答案:B

第八章测试

Theratioofthelineardimensionsoftheprototypeto,ordividedby,thecorrespondingdimensionsinthemodel.Itfollowsthatareasvaryas.（）

A:B:C:D:

答案:BFortheratiooftheinertiaforcestoviscousforce,theresultingparameteriscalledthe.（）

A:MachNumberB:FroudenumberC:ReynoldnumberD:WeberNumber

答案:CAdimensionlessquantityrelatedtotheratiooftheinertiaforcestothepressureforcesisknownasthe.（）

A:EulerNumberB:FroudenumberC:WeberNumberD:Reynoldnumber

答案:AInthemass-length-time(