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

ForwardbladeCRadialbladeDTransverseblade正確答案：ABC第3題Accordingtostructureandworkingprinciple,tunnelventilatorsaredividedintoACentrifugalfanBAxialflowfanCLocalventilatorD

Mainventilator正確答案：AB第4題Accordingtoitsservicescope,tunnelventilatorsaredividedintoAMainventilatorBAuxiliaryventilatorCLocalventilatorDCentrifugalfan正確答案：ABC第5題Accordingtotherequirements,thefanspeeddoesnotexceedtheratedvalue

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

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