大工秋《水力学》在线作业（Great works, autumn, hydraulics, online homework, ）

'大工11秋《水力学》在线作业2（Greatworks,11autumn,hydraulics,onlinehomework,2）Inthefallof11"hydraulics"onlinehomework2First,determinetheproblem1.inpressurepipelinewaterhammerphenomenoninacycleoffour6L/clongtimeforwaterhammerwave.A.errorB.rightAnswer:A1.depthofopenchannelflowflowpatterndiscriminationmethod,whenthewaterdepthislargerthanthecriticaldepth,jetflow.A.errorB.rightAnswer:AThe1.N-Nline,K-lineisthreeKandthebottomslopeperpendicularline.A.error B.rightAnswer:A2.theequivalentmodulusofflowthroughthecanalbottomslopei=0flow.A.errorB.rightAnswer:A2.criticalslope,N-NlineandK-lineoverlap.A.errorB.rightAnswer:B2.prismaticchannelconstantnon-uniformflowcurveofqualitativeanalysis,thepositiveslopeofthechannel,whenthechannelisverylong,inlessthannonuniformfloweffectwherethetangentcurveofwaterandN-Nwaterline,reachingauniformflow.A.errorB.right Answer:BMolecule3.prismaticchannelconstantnon-uniformflowdifferentialequations,whenIandJarenotequal,theflowisnonuniformflow.A.errorB.rightAnswer:BThe3.steptoeliminatewaterenergyreferstothekineticenergybeforethejumpsectionandthebacksectionoftheunitweightofwaterratio.A.errorB.rightAnswer:AThe3.seriestubebeforepipeflowisequaltotheflowandafterthepipeandtwopipesegmentsfromthenode.A.errorB.rightAnswer:B 4.whentheflowrateisequaltotherelativevelocity,theinterferencewaveupstreamofthepeakstagnationintheinterferencesource,theinfluenceofdiffusionrangefrominterferencesourcetothedownstream,theflowiscalledslow.A.errorB.rightAnswer:ATosolvethe4.flowmodulus,whenkeepingotherparametersunchanged,volumemodulusandChezycoefficientisproportionaltothesquareof.A.errorB.rightAnswer:AThe4.channelsarenotallowedtorushflowrockgenerallyaboutintherangeof15-80m/s.A.errorB.rightAnswer:AThe5.rectangularchannelwhenthebesthydraulicsection,the bottomwidthistwotimesthedepthofthewater.A.errorB.rightAnswer:B5.flowunderwaterflowiscalledpipesubmergeddischargetube.A.errorB.rightAnswer:B5.flowbyslowtransitiontojetwaterjump,butcannotdeterminethepositionofhydraulicjump.A.errorB.rightAnswer:AIn6.shortcalculationoflocalheadlossandhasadifferentmagnitudeofheadlossalongtheway,thegenerallosscanbeignored.A.error B.rightAnswer:A6.prismaticchannelconstantnon-uniformflowcurveofqualitativeanalysis,noaandBregionsinthecriticalslopearea,onlyC.A.errorB.rightAnswer:ALongtubesintoanodeflowandshouldbeequaltotheoutflowfromthenodeflowand6.parallel.A.errorB.rightAnswer:BThe7.istomaketheeconomicflowrateoftheminimumtotalcostofwatersupplysystemflow.A.errorB.right Answer:B7.fromtheconstructionperspective,Ishouldbeconsistentwiththeslopeoftheterrainslope,soastomakethecutandfillequal,reduceprojectcost.A.errorB.rightAnswer:B7.depthofopenchannelflowflowpatterndiscriminationmethod,whenthewaterdepthisequaltothecriticaldepthofflow,criticalflow.A.errorB.rightAnswer:BInthewholewavepipepassingbackandforthtimerequiredforaphase8.waterhammer.A.errorB.rightAnswer:B Inthe8.sectionshape,sizeandroughnessoftheprismaticchannelalongthesame,whenflowrateisconstant,thebottomslopeissteep,thenormaldepthisgreater.A.errorB.rightAnswer:A8.bottomslopemethodonlyforuniformflowinopenchannelflowjudgingthedegreeofurgency.A.errorB.rightAnswer:BNineAnyliquidthroughpipeparalleltothesameheadloss.A.errorB.rightAnswer:B9.waterhammerhasfavorablesideofit,usingthewaterhammerpressurecanberealized,hascertainusevalueinthelocal conditions.A.errorB.rightAnswer:BThe9.channelsarenotallowedtoredclayisconcernedaboutthegeneralflowrateintherangeof10-15m/s.A.errorB.rightAnswer:A10.inthehydraulicjumplengthcalculation,whenthehydraulicjumplengthis6.1timesthesequentdepthcalculation,isrequiredbeforethejumpsectionoftheFroudenumberintherangeof4.5-10.A.errorB.rightAnswer:B10.wateriswaterfromflowingdownthroughthecriticaldepthofthetransitiontolocalwaterjetwaterfallingsharplyphenomenon. A.errorB.rightAnswer:B10.uniformopenchannelflowconditionsgeneratedinalongtheroughcoefficientaccordingtothelinearrelationshipbetweenincreasing.A.errorB.rightAnswer:ATwo,RadioButtonListThe1.rectangularchannelwhenthebesthydraulicsection,thebottomwidthis10m,depthis().A.2mB.5mC.15mD.25mAnswer:B 1.atrapezoidsectionofirrigationcanal,watercutareaof39squaremeters,wetweek18.49m,hydraulicradius().A.1.25B.1.79C.2.11D.3.96Answer:C1.prismaticchannelconstantnon-uniformflowcurveofqualitativeanalysis,asgentle,is().A.N-NonthelineatK-KB.N-NislocatedinK-lineunderthelineTheC.N-NlineandK-lineoverlapThereisnoD.N-NlineAnswer:AA2.channelcrosssectionisrectangular,thewidthis2m,depthof1m,whilewetweek().A.2 B.4C.6D.8Answer:BHydraulicradiusR2.atrapezoidalcanalchannelfor5m,then(depth).A.8MB.10mC.15mD.50mAnswer:BA2.channelcrosssectionisrectangular,thewidthisB,depthofH,whilewetweek().A.b+2hB.b+hC.BH D.2bhAnswer:A3.iftheflowvelocityofv=12m/s,therelativevelocityisc=6m/s,theFroudenumberis().A.0.6B.0.8C.1D.2Answer:DThe3.sectionisatrapezoidopenchannel,thechannelbottomwidthof2.2M,depthof2m,theslopecoefficientm=1.5,whilewetweek()M.A.5.12B.6.37C.8.23D.9.41Answer:D The3.channelsarenotallowedforthegeneralflowofsandrushedabout(range).A.2.2-3.4B.1.2-5.15C.0.55-3.4D.0.35-2.2Answer:D4.asimplelongtube,flowQ=0.10m3/s,hydraulicgradientJ=0.015,theratioofresistanceforthepipe(s2/m6).A.1.500B.1.970C.2.835D.4.500Answer:AAtotalof4.pumpheadfor63.78m,thepumpefficiencyof75%,throughthepumpflowrateis60L/s,knownas9.8kN/m3,thedensityofwater,waterpumpinstalledcapacity(kW).A.15 B.25C.50D.100Answer:C4.awaterpumpinstalledcapacityof25kW,thepumpefficiencyof75%,throughthepumpflowrateis60L/s,theknownwaterdensitywas9.8kN/m3,totalheadofthepumpisequalto(m).A.52.34B.15.25C.22.93D.31.89Answer:D5.atrapezoidsectionofirrigationcanal,watercutareaof55squaremeters,wetweekis11m,thenthehydraulicradius().A.1.5mB.2.5m C.5mD.15mAnswer:CThephysicalmeaningoftheFroudenumber5.ismainlyexpressedontheroleinwater().A.inertialforceandgravityratioTheinertiaforceandgravityandB.C.inertiaforceandviscousforceratioD.inertiaforceandviscousforceandAnswer:A5.asimplelongtube,lengthL=600m,Q=0.21m3/sflow,hydraulicgradientJ=0.015,Thepiperesistance(s2/m6)thanfor.A.0.236B.0.340C.0.497D.0.582 Answer:BThreemultiple-choicequestions1.flowcalculationformulaofChezycoefficientrelatedtothefollowingfactors.()Thecross-sectionofA.B.sectionsizeC.sidewallroughnessD.slopeheightAnswer:ABC1.thewaterjumpfunctioncharacteristicsiscorrecttosaythat().A.depthbeforethejumpis,thesmallerthesequentdepthB.depthbeforethejumpisbigger,thegreaterthesequentdepthC.stepfunctionisthemaximumvalue,thecorrespondingdepthofcriticaldepthD.waterstepfunctionforminimumvalue,thecorrespondingdepthofcriticaldepth Answer:AD1.Froudenumberis()adimensionlessnumber.A.flowvelocityB.sectionareaC.velocityheadTherelativevelocityD.Answer:AD2.whentheFroudenumberislessthan1,then().TheroleofA.inthegravityflowplaysthemainroleTheroleofB.inthecurrentinertialforceplaysamainroleC.flowisslowD.jetflowAnswer:AC2.asimplelongtube,lengthL=100m,Q=0.15m3/sflow,hydraulicgradientJ=0.015,thefollowingstatementiscorrect(). A.piperatiovaluesof0.667s2/m6B.piperatiovaluesof2.832s2/m6C.pipeheadlossis1.5mD.pipeheadlossis5.6mAnswer:AC2.inthedesignofuniformflowchannels,thebesthydraulicsectionreferstothe()isknown,thedesignofcrosssectionareaofthesmallestsection.A.flowB.bottomslopeC.roughnesscoefficientD.areaAnswer:ABC3.thefollowingstatementiscorrect(C2).A.slopeThesteepslopeB.C.backwatercurve D.precipitationcurveAnswer:BCThecalculationof3.shorthydrauliccalculation,whichisincludedinthepipeline(hydraulic).A.pipelineinthevelocityheadB.localheadlossC.headlossalongthewayD.gravitylossAnswer:ABCThefollowing3.conditionsofproducinguniformflowinopenchanneliscorrecttosaythat().TheconstantA.alongthepathofconstantflowflowB.thevelocityconstantofunsteadyflowC.isthebottomslopeD.flatslopeAnswer:AC Therelationshipbetweentheparametersrelatedtothefollowing4.longtubeinthestatementiscorrect().A.velocityheadisfargreaterthanthelocalheadlossB.velocityheadisfargreaterthantheheadlossalongthewayC.headlossalongthewayisfargreaterthanthelocalheadlossD.andlocalheadlossofvelocityheadandmuchsmallerthantheheadlossalongthewayAnswer:CD4.inuniformflowinopenchannel,()isparalleltoeachother.A.headlineB.sealevellineC.piezometricheadlineThebottomlineD.Answer:ACD4.prismaticchannelconstantnon-uniformflowcurve,theB1curveiscorrecttosaythat(). A.backwatercurveB.precipitationcurveC.slopeThesteepslopeD.Answer:BCThe5.featuresoflongpipeflow,the()isacoincidence.ThepositionoftheA.headlineB.headlineC.piezometricheadlineThebottomlineD.Answer:BC5.prismaticchannelconstantnon-uniformflowdifferentialequationofthephysicalmeaning,thedenominatorofthestatementiscorrect().A.reflectsthefastandslowflowdegreeB.toreflectthelaminarorturbulentflowC.is1whentheflowisthedenominatorofcriticalflow D.is0whentheflowisthedenominatorofcriticalflowAnswer:AD5.thefollowing,whichbelongstothegeometricelementsofthehydraulicjump().A.depthbeforethejumpB.jumpheightSteplengthC.ThesequentdepthD.Answer:ABCD'