第1題Doesthiscoursehaveatotalof()

classhours?A16B32C48D64第2題Thenatureofthiscourseis()AProfessionalOptionalCoursesBLimitedprofessionalelectivecoursesCProfessionalcorecoursesDProfessionalFoundationCourses第3題TheconceptofpowderengineeringwasproposedbytheNationalMaterialsWorkof().AtheUnitedStatesofAmericaBJapanCBritainDChina第4題Thenameoftheparticlethatfirstexistedasasolidstateis()APrimaryparticleBAggregateparticleCAgglomerateparticlesDFlocculateparticles第5題Inaliquidsoliddispersionsystem,particlesarelooselyboundtogetherduetovariousphysicalforcesbetweenthem,andthenameoftheparticlegroupformedis()APrimaryparticleBAggregateparticleCAgglomerateparticlesDFlocculateparticles第6題Manyprimaryparticlesareaccumulatedbycertainchemicalforcesconnectedtotheirsurfaces.Thenameoftheparticleis()APrimaryparticleBAggregateparticleCAgglomerateparticlesDFlocculateparticles第7題Thelooseparticlegroupformedbyprimaryparticlesoraggregateparticlesthroughweakadhesion(angularbonding!)isnamed()APrimaryparticleBAggregateparticleCAgglomerateparticlesDFlocculateparticles第1題Adiameterthatdividestheprojectedareaofaparticleintotwoequalpartsinacertaindirectioniscalled()ADirectionalmaximumdiameterKrumbeindiameter,DKBMartindiameterDMCFerretdiameterDFDProjectedequivalentdiameter第2題Thedistancebetweentwoparallellinestangenttotheparticleprojectioninacertaindirectioniscalled()ADirectionalmaximumdiameterKrumbeindiameter,DKBMartindiameterDMCFerretdiameterDFDProjectedequivalentdiameter第3題Thetriaxialgeometricmeandiameterofpowderparticlesis()A(l+b)/2B(l+b+h)/3

C(lb)1/2

D(lbh)1/3第4題Thebiaxialgeometricmeandiameterofpowderparticlesis()A(l+b)/2

B(l+b+h)/3

C(lb)1/2

D(l+b+h)1/3第5題Thetriaxialaveragediameterofpowderparticlesis()A(l+b)/2

B(l+b+h)/3

C(lb)1/2D(l+b+h)1/3第6題Thebiaxialaveragediameterofpowderparticlesis()A(l+b)/2B(l+b+h)/3

C(lb)1/2D(l+b+h)1.2ParticleSizeDistribution-assignment第1題Thefrequencydistributionofpowderparticlesreferstoacertainparticlesize(representedbyDp)orarangeofparticlesizes(representedbyΔDp)Thepercentage(%)ofparticles(correspondingtothenumberofparticlesnp)presentinthesample,whichisthefrequencyorfrequency,expressedasf()orf(ΔDp).(

)第2題Underscreenaccumulationofpowderparticlesreferstotheaccumulationofthefrequencydistributionofparticlesizefromsmalltolargeparticlesizes,resultinginacorrespondingcumulativedistributioncalledunderscreenaccumulation.()第3題Thecumulativedistributionofpowderparticlesonthesievereferstotheaccumulationofthefrequencydistributionofparticlesizefromsmalltolargeparticlesizes,resultinginacorrespondingcumulativedistributioncalledundersieveaccumulation.()第4題TherelationshipbetweenthecumulativedistributionD(Dp)belowthesieveandthecumulativedistributionR(Dp)abovethesieveis()AD(Dp)+R(Dp)=1BD(Dp)+R(Dp)=100

CD(Dp)×R(Dp)=1

DD(Dp)×R(Dp)=100

第5題Thesmallerthedeviationcoefficient,thewidertheparticlesizedistribution.1.3ParticleShape-assignment第1題Theflatnessmoftheparticlesis()ALongdiameter/shortdiameter=l/bBShortdiameter/thickness=b/hCShortdiameter/longdiameter=b/lDLengthdiameter/thickness=l/h第2題Theparticlelengthnis()ALongdiameter/shortdiameter=l/bBShortdiameter/thickness=b/hCShortdiameter/longdiameter=b/lDLengthdiameter/thickness=l/h第3題Thefollowingparticlesphericityindicateswhichparticlehastheclosestsphericalshape()ASphericityψ=1.2BSphericityψ=1.6CSphericityψ=0.9DSphericityψ=0.6第4題VolumefullnessfVreferstotheratioofparticlevolumeVPtothevolumeoftheparticle'souterstraightcube()第5題AreafullnessfbreferstotheratiooftheprojectedareaAofaparticletoitsminimumcircumscribedrectangulararea()1.4ParticleSizeMeasurement-assignment第1題Whenmeasuringtheparticlesizedistributionofapowderusingtheelectricalinductionmethod,themeasuredpowderparticlesmustbedispersedinaconductiveelectrolytesolution.第2題Thespecificsurfaceareaofpowdercanbeobtainedfromthefollowingpowderparticlesizemeasurementmethods:

(

)ASieveanalysismethodBsedimentationCTelepathyDBETmethod第3題Whichofthefollowingpowderparticlesizemeasurementmethodsobtainsaresultexpressedasapercentageofthenumber()ASieveanalysismethodBsedimentationCTelepathyDBETmethod第4題Whenmeasuringtheparticlesizeofpowderbylaserscatteringmethod,thesmallerthescatteringaperture,thesmallertheparticlesize.第5題Thefollowingparticlesizemeasurementmethodscanobservetheshapeofparticles:()ASieveanalysismethodBMicroscopicmethodCsedimentationDTelepathy第6題Themeshsizeofthe200targetstandardsieveissmallerthanthemeshsizeofthe300targetstandardsieve.1.5PowderSurfaceProperties-assignment第1題WhenthepHvalueofthesolutionis>theisoelectricpoint,thepowdersurfacecarriesanegativecharge()第2題

WhenthepHvalueofthesolutionis<theisoelectricpoint,thepowdersurfacecarriesanegativecharge()第3題

Thechemicalpropertiesofthepowdersurfacearefixed.()第4題Theessenceofsurfacephenomenaandsurfaceenergyofpowderparticlesis____and____.正確答案：:Unsaturationofthesurfaceofpowderparticles.正確答案：:Nonhomogeneityofthesurfaceofpowderparticles.第5題Thespecificsurfaceareaofthepowderrefersto____。正確答案：:Surfaceareaperunitmass第6題Theadsorptionofliquidsorgasesbypowderscanbedividedintotwotypesaccordingtothenatureoftheirforces:________正確答案：:physicaladsorption正確答案：:chemicaladsorption第7題nycontactbetweentwodifferentobjectswillgenerateanelectricpotentialbetweenthetwophases,whichiscausedby____.正確答案：:Chargeseparation1.6Powderaccumulationcharacteristics-assignment第1題TheporosityofthedensestfillinHorsfieldis()A0.039B0.149C0.158D0.009第2題TheFullerconstantqforthedensestfillingofcontinuousanddiscontinuousparticlesizesystemsis()A1B1/2C1/3D1/4第3題TheFullerconstantqforthedensestfillingofcontinuousanddiscontinuousparticlesizesystemsis()A1B1/2C1/3D1/4第4題FillingrateofpowderλAndtheporosityofthepowderεTherelationshipofis()Aλ+ε=100Bλ+ε=1Cλ*ε=100Dλ*ε=1第5題ThespacingbetweenthecentersoftwolayersofsphericalparticlecubesfilledwithequaldiameterDparticlesis()ADB2DC0.414DD0.528D第6題TheorthotrapezoidofsphericalparticleswithdiameterDisfilled,andthecenterdistancebetweenthetwolayersofsphericalparticlesis().ADB2DC0.414DD0.528D第7題ThespacingbetweentwolayersofsphericalcoresfilledbyrhombohedralparticleswiththeparticlesizeofDis().ADB2DC0.414DD0.528D第8題ThetruedensityofapowderymaterialisρP=3000kg/m3,itsbulkdensityρB=1800kg/m3,withastackedporosityof____正確答案：:40%第9題Thetruedensityofapowdermaterialisρp=3000kg/m3.Whenthepowderispiledupwiththevoidfractionε=40%,itsvolumedensity____正確答案：:1800kg/m3第10題Therearetwobasicarrangementlayersforregularstackingofsphericalparticlegroupsofequaldiameter,namely[Fillintheblank1]and[Fillintheblank2].________

正確答案：:square正確答案：:delta1.7PowderFrictionCharacteristics-assignment第1題Thefrictionangleofthe"viscosity"ofthepowderis()AAngleofreposeBinternalfrictionangleCWallfrictionangleDMotionfrictionangle第2題Theangleformedduetothe

____and____forcesbetweenpowderparticlesiscollectivelyreferredtoasthefrictionangle正確答案：:friction正確答案：:cohesion第3題Thefrictionanglebetweenpowderparticlesisanimportantparametercharacterizingpowder____and____正確答案：:Mechanicalbehavior正確答案：:Liquidity第4題Thesmallertheangleofrepose,thebetterthefluidityofthepowder.()第5題Thelargerthesphericityoftheparticles,thesmallertherestingangle,andthebetterthefluidityofthepowder.()第6題Whentheparticlesizeislessthan0.2mm,thesmallertheparticlesize,thesmallertheangleofrepose,andthebetterthefluidity.()第7題Verticalpressurefromdirectsheartestδ,Thecorrespondingshearforceisτ。Whendrawingtodeterminethefrictionangleinthepowder,theabscissaisτ,Theordinateisδ。()第8題Themaximumprincipalstressforthetriaxialcompressiontestisδ1.Minimumprincipalstressδ3,thecoordinateofthecenteroftheMohrcircleis____，

andtheradiusoftheMohrcircleis____正確答案：:(δ1+δ3)/2，0正確答案：:(δ1-δ3)/21.8Settlingspeedofpowderinfluid-assignment第1題RepWhenthemovementofparticlessettlinginthefluidislessthan1,theparticlemotionstatebelongsto()AHighturbulenceBswiftcurrentCTransitionalflowDlaminarflow第2題When1<Rep<1000,theflowstateofparticlessettlinginthefluidbelongsto()AHighturbulenceBswiftcurrentCTransitionalflowDlaminarflow第3題When1000<Rep<2×105,theflowstateofparticlessettlinginthefluidbelongsto(

)AHighturbulenceBswiftcurrentCTransitionalflowDlaminarflow第4題WhenRep>2×105，theflowstateofparticlessettlinginthefluid（

）AHighturbulenceBswiftcurrentCTransitionalflowDlaminarflow第5題ThefollowingsphericityΨFreesedimentationofdifferentparticlesinthesamefluid,resistancecoefficientξThesmallestis()AΨ=0.6

BΨ=0.9CΨ=0.4

DΨ=0.3第6題Sphericalparticlesinaninfiniteandvaststaticfluidspacedonotundergofreesedimentationduetotheinfluenceofotherparticlesandcontainerwalls.第7題Infact,inalimitedfluidspace,whenthevolumeconcentrationofaparticlegroupislowandtheparticlesdonotdirectlyorindirectlyaffecteachother'ssedimentationthroughthefluid,itcanalsobeconsideredasfreesedimentation.第8題Thesedimentationprocessofparticlesrelativetothevelocityu0ofthefluidiscalledthesedimentationvelocity.第9題Particleswithdifferentdensitiesthatsettleinthefluidatthesamesettlingspeedarecalledisostaticparticles.第10題Particlegroupssettleinafinitefluidspaceandinteractwitheachother.Thissettlementiscalledinterferencesettlement.Chapter1Test第1題Particlegroupssettleinafinitefluidspaceandinteractwitheachother.Thissettlementiscalledinterferencesettlement.第2題Verticalpressurefromdirectsheartestδ,Thecorrespondingshearforceisτ。Whendrawingtodeterminethefrictionangleinthepowder,theabscissaisτ,Theordinateisδ。()第3題Thefrictionanglebetweenpowderparticlesisanimportantparametercharacterizingpowder____and____正確答案：:Mechanicalbehavior正確答案：:Liquidity第4題Thelargerthesphericityoftheparticles,thesmallertherestingangle,andthebetterthefluidityofthepowder.()第5題Therearetwobasicarrangementlayersforregularstackingofsphericalparticlegroupsofequaldiameter,namely[Fillintheblank1]and[Fillintheblank2].________

正確答案：:square正確答案：:delta第6題Thespecificsurfaceareaofthepowderrefersto____。正確答案：:Surfaceareaperunitmass第7題Theadsorptionofliquidsorgasesbypowderscanbedividedintotwotypesaccordingtothenatureoftheirforces:________正確答案：:physicaladsorption正確答案：:chemicaladsorption第8題nycontactbetweentwodifferentobjectswillgenerateanelectricpotentialbetweenthetwophases,whichiscausedby____.正確答案：:Chargeseparation第9題Whenmeasuringtheparticlesizedistributionofapowderusingtheelectricalinductionmethod,themeasuredpowderparticlesmustbedispersedinaconductiveelectrolytesolution.第10題Theparticlelengthnis()ALongdiameter/shortdiameter=l/bBShortdiameter/thickness=b/hCShortdiameter/longdiameter=b/lDLengthdiameter/thickness=l/h第11題Thefollowingparticlesphericityindicateswhichparticlehastheclosestsphericalshape()ASphericityψ=1.2BSphericityψ=1.6CSphericityψ=0.9DSphericityψ=0.6第12題VolumefullnessfVreferstotheratioofparticlevolumeVPtothevolumeoftheparticle'souterstraightcube()第13題Thetriaxialaveragediameterofpowderparticlesis()A(l+b)/2

B(l+b+h)/3

C(lb)1/2D(l+b+h)1/3第14題Inaliquidsoliddispersionsystem,particlesarelooselyboundtogetherduetovariousphysicalforcesbetweenthem,andthenameoftheparticlegroupformedis()APrimaryparticleBAggregateparticleCAgglomerateparticlesDFlocculateparticles第15題Manyprimaryparticlesareaccumulatedbycertainchemicalforcesconnectedtotheirsurfaces.Thenameoftheparticleis()APrimaryparticleBAggregateparticleCAgglomerateparticlesDFlocculateparticles第16題第17題第18題第19題第20題2.1CrushingTheory-assignment第1題Thunderbolt'sLaw-Thesurfaceareatheoryisapplicabletothe()stageofpulverization.AfinegrindingBcoarsegrindCMediumandfinegrindingDtattered第2題Kirk'slaw-volumetheoryisapplicabletothe()stageofpulverization.AfinegrindingBcoarsegrindCMediumandfinegrindingDtattered第3題Bond'sLaw-CrackTheoryappliestothe()stageofcrushing.AfinegrindingBcoarsegrindCMediumandfinegrindingDtattered第4題Themaincrushingmethodcorrespondingtothevolumecrushingmodelis().AcrimpBlashCgrindDseparation第5題Themaingrindingmethodcorrespondingtothesurfacegrindingmodelis().AcrimpBlashCgrindDseparation第6題Thereasonwhytheactualstrengthofsolidmaterialsislowerthanthetheoreticalstrengthis____。正確答案：:Internaldefectsinthematerial第7題Thetwotechnicalandeconomicindicatorsforevaluatingcrushingmachineryare

________。正確答案：:Crushingratio正確答案：:Unitpowerconsumption第8題Whatarethetwotypesofcrushing?________

正確答案：:tattered正確答案：:Grinding2.2CrushingTechnology-assignment第1題Themaincrushingmethodsofajawcrusherare(

)AcrimpBlashCgrindDseparation第2題Themaincrushingmethodforthefinegrindingbinofaballmillis()

AcrimpBlashCgrindDseparation第3題Themaincrushingmethodsofahammercrusherare()AcrimpBlashCgrindDseparation第4題Themaincrushingmethodsoftheimpactcrusherare()AcrimpBlashCgrindDseparation第5題Themaincrushingmethodofvibrationmillis(

)AcrimpBlashCgrindDseparation第6題Themaincrushingmethodofairflowmillis()AcrimpBlashCgrindDseparation2.3Preparationofpowderbyatomization-assignment第1題Thehigherthepressureofgasorwater,thecoarsertheresultingpowder.()第2題Whenpreparingmetalpowderbyatomizationmethod,thehighertheviscosityoftheliquidmetal,thegreaterthesphericityofthepreparedpowder.()第3題Atthesameatomizationpressureandnozzle,thehigherthesuperheattemperatureoftheliquidmetal,thesmallertheparticlesizeofthepreparedmetalpowder.()第4題Atthesameatomizationpressureandnozzle,thehigherthesuperheattemperatureoftheliquidmetal,thesmallerthesphericityofthepreparedmetalpowder.()第5題Whentheatomizationpressureandotherprocessparametersremainunchanged,thefinerthemetalflowdiameter,thesmallertheparticlesizeofthepreparedpowder.()第6題Whenpreparingmetalpowderbyatomizationmethod,thehighertheviscosityoftheliquidmetal,thefinertheparticlesizeofthepowder.()第7題Whenusinggasatomizationmediumtopreparemetalpowder,sphericalpowdercanbeeasilyobtained.()第8題Whenusingwaterastheatomizingmediumtopreparemetalpowder,sphericalpowdercanbeeasilyobtained.()第9題Thewateratomizationmethodisnotsuitableforhighlyactivemetalsandalloys,superalloys,etc.()第10題Theatomizationmethodbelongstothechemicalpulverizationmethod.()2.4PreparationofPowderbyGasPhaseMethod-assignment第1題Thereactantforthepreparationofpowderbygasphasemethodisa____phase,andtheproductisa

____phase正確答案：:gas正確答案：:firm第2題Thegasphasemethodcanberoughlydividedintotwotypes.Oneis____andtheotheris____.正確答案：:Evaporationcondensationmethodwithoutchemicalreactioninthesystem正確答案：:Gasphasechemicalreactionmethod2.5Preparationofpowdersbyliquidphasemethodandsolidphasemethod-assignment第1題Thesolventevaporationmethodforpreparingpowderbelongstoaphysicalmethod.()第2題Themethodofaddingaprecipitatorsolutiontoasaltsolutionisapositivedropmethod.()第3題Theproductofthehydrolysisreactionofmetalsaltsisgenerallyhydroxideorhydrateprecipitation.()第4題Theadvantageofalcoholysisisitslowcost.()第5題Hydrothermalmethodscanpreparecompoundswithspecialoxidationstatesthatcannotbeobtainedbytraditionalmethods.()第6題Thesolvothermalmethodisbeneficialtotheformationofamorphousmaterials.()第7題Inordertopreparenanometerpowdersbymicrolotionmethod,microlotionmustbepreparedfirst.Twokindsofsolublesolventsformmicroemulsionundertheactionofsurfactant,andthennanoparticlescanbeobtainedbynucleation,coalescence,agglomerationandheattreatmentinasmallmicroarea.(

)第8題Thefourmainparameterscontrollingsolgelare____、____、____,____。正確答案：:PHvalueofthesolution正確答案：:Ionormolecularconcentrationofthesolution正確答案：:reactiontemperature正確答案：:time第9題Accordingtotheformationmodeofsolgel,thesolgelmethodcanbedividedintothreetypes:____、____,____。

正確答案：:Traditionalcolloidtype正確答案：:Inorganicpolymer正確答案：:complexChapter2Test第1題Themethodofaddingaprecipitatorsolutiontoasaltsolutionisapositivedropmethod.()第2題Theproductofthehydrolysisreactionofmetalsaltsisgenerallyhydroxideorhydrateprecipitation.()第3題Theadvantageofalcoholysisisitslowcost.()第4題Hydrothermalmethodscanpreparecompoundswithspecialoxidationstatesthatcannotbeobtainedbytraditionalmethods.()第5題Thesolvothermalmethodisbeneficialtotheformationofamorphousmaterials.()第6題Inordertopreparenanometerpowdersbymicrolotionmethod,microlotionmustbepreparedfirst.Twokindsofsolublesolventsformmicroemulsionundertheactionofsurfactant,andthennanoparticlescanbeobtainedbynucleation,coalescence,agglomerationandheattreatmentinasmallmicroarea.(

)第7題Thefourmainparameterscontrollingsolgelare____、____、____,____。正確答案：:PHvalueofthesolution正確答案：:Ionormolecularconcentrationofthesolution正確答案：:reactiontemperature正確答案：:time第8題Accordingtotheformationmodeofsolgel,thesolgelmethodcanbedividedintothreetypes:____、____,____。

正確答案：:Traditionalcolloidtype正確答案：:Inorganicpolymer正確答案：:complex第9題Thesolventevaporationmethodforpreparingpowderbelongstoaphysicalmethod.()第10題Thereactantforthepreparationofpowderbygasphasemethodisa____phase,andtheproductisa

____phase正確答案：:gas正確答案：:firm第11題Thegasphasemethodcanberoughlydividedintotwotypes.Oneis____andtheotheris____.正確答案：:Evaporationcondensationmethodwithoutchemicalreactioninthesystem正確答案：:Gasphasechemicalreactionmethod第12題Thehigherthepressureofgasorwater,thecoarsertheresultingpowder.()第13題Whenpreparingmetalpowderbyatomizationmethod,thehighertheviscosityoftheliquidmetal,thegreaterthesphericityofthepreparedpowder.()第14題Atthesameatomizationpressureandnozzle,thehigherthesuperheattemperatureoftheliquidmetal,thesmallertheparticlesizeofthepreparedmetalpowder.()第15題Atthesameatomizationpressureandnozzle,thehigherthesuperheattemperatureoftheliquidmetal,thesmallerthesphericityofthepreparedmetalpowder.()第16題Whentheatomizationpressureandotherprocessparametersremainunchanged,thefinerthemetalflowdiameter,thesmallertheparticlesizeofthepreparedpowder.()第17題Whenpreparingmetalpowderbyatomizationmethod,thehighertheviscosityoftheliquidmetal,thefinertheparticlesizeofthepowder.()第18題Whenusinggasatomizationmediumtopreparemetalpowder,sphericalpowdercanbeeasilyobtained.()第19題Whenusingwaterastheatomizingmediumtopreparemetalpowder,sphericalpowdercanbeeasilyobtained.()第20題Thewateratomizationmethodisnotsuitableforhighlyactivemetalsandalloys,superalloys,etc.()第21題Theatomizationmethodbelongstothechemicalpulverizationmethod.()第22題Themaincrushingmethodsofajawcrusherare(

)AcrimpBlashCgrindDseparation第23題Themaincrushingmethodforthefinegrindingbinofaballmillis()

AcrimpBlashCgrindDseparation第24題Themaincrushingmethodsofahammercrusherare()AcrimpBlashCgrindDseparation第25題Themaincrushingmethodsoftheimpactcrusherare()AcrimpBlashCgrindDseparation第26題Themaincrushingmethodofvibrationmillis(

)AcrimpBlashCgrindDseparation第27題Themaincrushingmethodofairflowmillis()AcrimpBlashCgrindDseparation第28題Thunderbolt'sLaw-Thesurfaceareatheoryisapplicabletothe()stageofpulverization.AfinegrindingBcoarsegrindCMediumandfinegrindingDtattered第29題Kirk'slaw-volumetheoryisapplicabletothe()stageofpulverization.AfinegrindingBcoarsegrindCMediumandfinegrindingDtattered第30題Bond'sLaw-CrackTheoryappliestothe()stageofcrushing.AfinegrindingBcoarsegrindCMediumandfinegrindingDtattered第31題Themaincrushingmethodcorrespondingtothevolumecrushingmodelis().AcrimpBlashCgrindDseparation第32題Themaingrindingmethodcorrespondingtothesurfacegrindingmodelis().AcrimpBlashCgrindDseparation第33題Thereasonwhytheactualstrengthofsolidmaterialsislowerthanthetheoreticalstrengthis____。正確答案：:Internaldefectsinthematerial第34題Thetwotechnicalandeconomicindicatorsforevaluatingcrushingmachineryare

________。正確答案：:Crushingratio正確答案：:Unitpowerconsumption第35題Whatarethetwotypesofcrushing?________

正確答案：:tattered正確答案：:Grinding第36題第37題第38題3.1Powdersurfacemodification-assignment第1題Targetedimprovementofthesurfacecrystalstructureandfunctionalgroupsofthepowdersurfaceaccordingtotheneedsofapplicationsbelongstopowdersurfacemodification.()第2題Targetedimprovementofthewettabilityofthepowdersurfaceaccordingtotheneedsoftheapplicationbelongstopowdersurfacemodification.()第3題Purposefullychangingtheelectricalpropertiesofpowdersaccordingtotheneedsofapplicationsbelongstopowdersurfacemodification.()第4題Targetedchangesinpowderreactioncharacteristicsaccordingtoapplicationneedsbelongtopowdersurfacemodification.()第5題Duetotheexistenceofthecoatinglayer,thestericrepulsiveforcebetweentheparticlesinthephysicalcoatingmodificationofthepowdersurfaceplaysaroleinweakeningorshieldingtheirreaggregation.()第6題Microencapsulationisasurfacemodificationmethodthatcoversthesurfaceofaliquid,solid,orgas(corematerial)withauniformandthickfilm.Thecoatedfilmcreatesastericrepulsiveforcebetweenparticles,whichplaysaroleinweakeningorshieldingtheirreaggregation.()第7題Thesurfacefreeenergyofpowderaftersurfacemodificationgenerallyincreases.()第8題Inonecase,aftersurfacemodificationofinorganicmineralfillerswithorganicsurfacemodifiers,thecontactangleofthepowdersurfaceincreases.()3.2Agglomerationanddispersionofpowderparticles-assignment第1題Themainreasonforpowderdryinganddispersionistodestroythe()betweenpowderparticles.AVanderWaalsforceBLiquidbridgeforceCelectrostaticforceDmechanicalinteraction第2題Whentherelativehumidityoftheairexceeds(),watervaporbeginstocondenseonthesurfaceoftheparticlesandbetweentheparticles,whichgreatlyenhancestheagglomerationeffectduetotheformationofaliquidbridgebetweentheparticles.A45%B55%C65%D90%第3題Themainreasonforpowderagglomerationis____正確答案：:Forcebetweenpowderparticles第4題Powderdispersionreferstothestateinwhichpowderparticlesmoveincoherently____.正確答案：:freedom第5題Thesizerelationshipoftheactionofpowderparticlesinagasis:liquidbridgeforce>vanderWaalsforce>electrostaticforceofinsulator>electrostaticforceofconductor.()第6題ThevanderWaalsforcebetweenparticlesintheliquidphaseisarepulsiveforce.()第7題Theelectrostaticforceinthedoublelayerbetweenparticlesintheliquidphaseisarepulsiveforce.(

)第8題Thestericrepulsiveforcebetweenparticlesintheliquidphaseisarepulsiveforce.()第9題Thesolvationforcebetweenparticlesintheliquidphaseisgravitationalforce.(

)第10題Thehydrophobicforcebetweenparticlesintheliquidphaseisarepulsiveforce.(

)3.3Grading-assignment第1題Thegradingparticlesizereferstotheparticlesizewithapartialgradingefficiencyof()A10%B50%C60%D90%第2題GradingaccuracyKrefersto()A(d)(15)(/d)(95)()B(d)(35)(/d)(65)()C(d)(75)(/d)(25)()D(d)(95)(/d)(15)()第3題Whichofthefollowingclassificationdeviceshasthehighestclassificationaccuracy()AK=1.2BK=1.5CK=0.8DK=0.9第4題Giventhemassmofacomponentobtainedafterclassificationandthemassm0ofthecomponentcontainedinthepowderbeforeclassification,thentheclassificationefficiencyηis____正確答案：:m/m0*100%第5題Theabscissaofthepartialclassificationefficiencycurveis____

andtheordinateis____。

正確答案：:Particlesize正確答案：:Gradingefficiencyofthissection3.4Separation-assignment第1題Thereasonfortheelectrificationofchargedparticlesduringtheoperationofanelectricdustcollectoris()AProducedbyionizationofparticlesinahigh-voltageelectricfieldBTheparticlesadsorbthechargegeneratedbytheionizationofgasinahigh-voltageelectricfieldCProducedbyparticleadsorptionofpositivechargereleasedbypositiveelectrodeDProducedbyparticleadsorptionofnegativechargereleasedbynegativeelectrode第2題Thetotaldustcollectionefficiencyoftwodustcollectorsinseriesis().Aη1+η2(1―η1)Bη1+η2Cη1+η2(1―η2)Dη1+η2(1+η2)第3題Thesecondfiltermediumofbagfilterrefersto()APressclothBFilterclothandacertainthicknessofdustlayeronthefilterclothCAcertainthicknessofdustlayeronthefilterclothDDustlayer第4題Thedustcollectionefficiencyoftheelectricdustcollectorcanreach()above.A80%B85%C90%D99%第5題Theprincipleofthefollowing()inertialdustcollectoristochangethedirectionoftheairflowtocapturefinerparticlesALouvertypeBBendtypeCMultilayerbaffletypeDImpacttype3.5Mixing-assignment第1題Theparticlesinsidethepowderslideeachother,formingaslidingsurface,leadingtolocalmixing.Thismixingmechanismis(

)ADiffusionmixingBConvectivemixingCShearmixingDUniformmixing第2題Themixingmechanismoflarge-scalerandommovementofparticlesduringpowdermixingis()ADiffusionmixingBConvectivemixingCShearmixingDUniformmixing第3題Themixingmechanismofsmallscalerandommovementofparticlesduringpowdermixingis(

)ADiffusionmixingBConvec