雨课堂学堂在线学堂云Tunnel Construction Ventilation(沈阳工业大学)单元测试考核答案

第1题ItcanbesmelledwhentheconcentrationofSO2intheairreaches()A0.0001%B0.0002%C0.0003%D0.0005%第2题WhentheconcentrationofNO2inthetunnelreaches,peoplewillfeelthroatirritation()A0.004%B0.006%C0.01%D0.025%第3题ItcanbesmelledwhentheH2Sconcentrationinthetunnelreaches()A0.0001%B0.001%C0.01%D0.1%第4题Whentheoxygencontentinthetunneldecreasestoacertainlevel,peoplewilllosetheirabilitytowork()A17%B15%C12%D3%第5题Accordingtotheregulations,theoxygencontentinthetunnelshallnotbelessthan()A5%B10%C15%D20%第6题WhentheconcentrationofCO2inthetunnelexceeds,itmustbestoppedfortreatment()A1.0%B1.5%C2.0%D2.5%第7题TheCO2concentrationinthetotalreturnairflowshallnotexceed()A0.5%B0.65%C0.7%D0.75%第8题TheCO2concentrationinthetunnelshallnotexceed()A0.1%B0.2%C0.3%D0.5%第9题WhentheCOconcentrationisreducedtowhatlevel,itwillcauseslightheadache()A0.02B0.08C0.32D1.28第10题Whentheoxygenconcentrationintheairdropstowhatlevel,peoplewillhavedifficultybreathing()A17%B15%C12%D3%第1题MeasurestoreducelocalresistanceoftunnelincludeATrytoavoidsuddenexpansionorreductionoftheroadwaysectionBThesectionattheconnectionshallchangegraduallyCTrytoavoidrightangleturningDDonotparkvehiclesorstackwoodinthetunnel正确答案：ABCD第2题MeasurestoreducetunnelfrictionresistanceincludeAReducefrictioncoefficientBReducetunnellengthCEnsuresufficienttunnelsectionDSelectthesectionwithsmallerperimeter正确答案：ABCD第3题ThetotalresistanceofthetunnelincludesAFrictionalresistanceBLocalresistanceCAirflowresistance正确答案：AB第4题CommontypesoflocalresistanceincludeAMutationBGradientCTurningDBifurcationandconvergence正确答案：ABCD第5题Whentheoxygencontentinthetunneldecreasestowhatextent,peoplewilllosetheirmindsA17%B17%C12%D3%第6题Duetothechangeoftunnelsection,bifurcationorconvergence,theuniformflowisaffectedanddestroyedinlocalareas,resultingintheenergylossofwindflow.ThisresistanceiscalledAFrictionalresistanceBLocalresistanceCAirflowresistance第7题Whenairflowsinthetunnel,theresistancecausedbythefrictionbetweenthefluidandthetunnelwalliscalledAFrictionalresistanceBLocalresistanceCAirflowresistance第8题ThejudgmentbasisforflowpatternofpipelineflowisAReBNuCPrDLe第9题Whentheflowvelocityislarge,themovementvelocityofthefluidparticlechangesatanytimeinsizeanddirection,becomingamixedturbulentflow,calledALaminarflowBTurbulentflowCMixedflow第10题Whentheflowrateislow,thefluidparticlesdonotmixwitheachotherandmoveinlayersparalleltothepipeaxis,whichiscalledALaminarflowBTurbulentflowCMixedflowChapter3Exercises第1题ThefollowingperformanceparametersofthefanincludeAWindpressureBAirvolumeCAirvolumeDEfficiency正确答案：ABCD第2题ThetypesofcentrifugalfanbladesaredividedintoABackwardbladeB

ForwardbladeCRadialbladeDTransverseblade正确答案：ABC第3题Accordingtostructureandworkingprinciple,tunnelventilatorsaredividedintoACentrifugalfanBAxialflowfanCLocalventilatorD

Mainventilator正确答案：AB第4题Accordingtoitsservicescope,tunnelventilatorsaredividedintoAMainventilatorBAuxiliaryventilatorCLocalventilatorDCentrifugalfan正确答案：ABC第5题Accordingtotherequirements,thefanspeeddoesnotexceedtheratedvalue

A60%B70%C80%D90%第6题ThedrawingprincipleoffanparallelcharacteristiccurveisAEqualairpressure,constantairvolumeBAirpressureadditionandairvolumeadditionCTheairpressureisaddedandtheairvolumeisequalDTheairpressureisequal,andtheairvolumeisadded第7题Whenfansareconnectedinparallel,thetotalwindpressureisAWindpressureofeachfanBTotalwindpressureofallfansCUnchangedDDecrease第8题Whenfansareconnectedinseries,thetotalairvolumeis

AAirvolumeofeachfanBTotalairvolumeofallfansCUnchangedDDecrease第9题Fromaneconomicpointofview,theoperatingefficiencyofthefanisnotlowerthanA50%B60%C70%D80%第10题VentilationformedbynaturalfactorsiscalledANaturalventilationBMechanicalventilationCMixedventilationChapter4Exercises第1题ThethreelawsofairvolumedistributionincludeAAirvolumebalancelawBLawofwindpressurebalanceCDraglawDLawofconservationofenergy正确答案：ABC第2题ThemethodstochangetheworkingcharacteristicsofthefanincludeAChangetheimpellerspeedofthefanBChangingthebladeinstallationangleofaxialflowfanCChangethebladeangleofthecentrifugalfan'sfrontguideDShortenthetotallengthoftheairflowroute正确答案：ABC第3题ThemainmeasuresoftunnelairflowresistancereductionregulationmethodincludeAEnlargesectionalareaBReducefrictioncoefficientCRemoveobstaclesinthetunnelDShortenthetotallengthoftheairflowroute正确答案：ABCD第4题ThemainmeasuresoftunnelairflowresistanceincreasingregulationmethodincludeAAdjustthewindshieldBAdjusttheaircurtainCRegulatingaircurtainDRegulatingpressure正确答案：ABC第5题ThelocalairvolumeregulationmethodsoftunnelincludeAResistanceincreasingmethodBDragreductionmethodCAuxiliaryfanregulationmethodDOveralladjustment正确答案：ABC第6题Whentheoxygencontentinthetunneldecreasestoacertainlevel,peoplewilldiequicklyA17%B15%C12%D3%第7题ThemostcommonlyusedmethodoftunnelairflowresistanceincreasingregulationisARegulatingpressureBAdjusttheaircurtainCRegulatingaircurtainDAdjustthewindshield第8题Whenthewindresistanceofabranchintheairnetworkchanges,thechangeamplitudeofairpressureandairvolumeofeachbranchisAThisbranchisthelargestBThisbranchisthesmallestCSamerangeofchange第9题Whenthewindresistanceofabranchintheairnetworkdecreases,howdoesthewindpressureofthebranchchangeADecreaseBIncreaseCUnchanged第10题Whenthewindresistanceofabranchintheairnetworkincreases,howdoestheairflowofthebranchchangeADecreaseBIncreaseCUnchangedChapter5Exercises第1题ThecalculationofairdemandforheadingfaceincludesAAirvolumerequiredforremovingblastingsmokeBAirvolumerequiredforgasdischargeCAirvolumerequiredfordustremovalDCheckandcalculatetheairvolumeaccordingtothewindspeed正确答案：ABCD第2题ThedisadvantagesofejectorventilationareALowwindpressureBSmallairvolumeCLowefficiencyDThereispondingproblem正确答案：ABCD第3题TheadvantagesofejectorventilationareANoelectricalequipmentBNonoiseCSimpleequipmentDHighsecurity正确答案：ABCD第4题ThecharacteristicsofdrawoutventilationareADirtyairflowsthroughthefanBShorteffectiverangeCPoorsmokeexhausteffectDDonotuseflexibleairduct正确答案：ABCD第5题ThecharacteristicsofforcedventilationareAThefanisarrangedinthefreshairflowBLongeffectiverangeCHighwindspeedattheworkingfaceDFlexibleairductcanbeused正确答案：ABCD第6题ThecommonventilationmethodsoflocalfanventilationaredividedintoAForcedventilationBDrawoutventilationCMixedventilationDGeneralventilation正确答案：ABC第7题Accordingtotheventilationmode,localventilationcanbedividedintoAMainfanairpressureventilationBEjectorventilationCLocalfanventilationDGeneralventilation正确答案：ABC第8题Usingtheventilationnegativepressuregeneratedbytheejector,theventilationmethodofguidingairthroughtheairductisAMechanicalventilationBNaturalventilationCLocalventilationDEjectorventilation第9题TheventilationmodeforlocalfantopressairintotheairductisAForcedventilationBDrawoutventilationCMixedventilationDGeneralventilation第10题ThemainmethodforlocalventilationoftunnelisAMainfanairpressureventilationBEjectorventilationCLocalfanventilationDGeneralventilationChapter6Exercises第1题FeaturesofthecentralventilationsystemincludeASmallquantitiesBLowinitialinvestmentCSuitableforareaswithcomplexterrainDLargeventilation正确答案：AB第2题Accordingtothedifferentpositionsofinletandreturnwellsinthewellfield,theventilationsystemcanbedividedintoACentralBDiagonalformCRegionalDHybrid正确答案：ABCD第3题ThetunnelventilationsystemincludesAVentilationpowerBVentilationnetworkCVentilationcontrolfacilitiesDSafetydevices正确答案：ABC第4题Thewindspeedbetweenthesuctioninletofthelocalfanandthereturnairflowofthehe