雨课堂学堂在线学堂云《Separation Engineering（浙江工业）》单元测试考核答案

第1题WhichstatementisNOTCORRECTaboutthedisadvantagesofusingaMSA?ANeedforanadditionalseparatortorecoverMSAforrecycleBNeedtoreducepressureCMoredifficultdesignproceduresDPossibleproductcontamination第2题Whichofthefollowingseparationtechniquesexploitsdifferencesinelectricchargeanddiffusivity?

AChromatographyBElectrophoresisCDistillationDLiquidChromatography第3题Whichofthefollowingisnotseparationbybarrier?ADialysisBGaspermeationCOsmosisDDistillation第4题Whatmethodshouldweusetoseparatepenicillinfromwaterinafermentationbroth?ADistillationBCrystallizationCLiquid-LiquidextractionDReverseOsmosis第5题Crystallizationbelongstowhichtypeofbasicseparationtechnique:ASeparationbyphaseadditionBSeparationbybarriersCSeparationbysolidagentDSeparationbyphasecreation第6题WhatistheroleofEnergy-separatingagent(ESA)？AInvolvesheattransferBInvolvesmasstransferCActsasanagitatorDIsacatalyst第7题Magneticseparationisdependentondifferenceinvolatilitytoseparate?第8题Achemicalorbiochemicalplantcanbeoperatedinbatch-wisemanner.第9题Whatarethesplitfractionsandsplitratiosintheredframesinthetable2?ASF=0.7395;SR=2.84BSF=0.7495;SR=2.84CSF=0.8855;SR=2.84DSF=0.8855;SR=7.72第1题Iftheminimumworkofseparationis100KJandthelostworkis1000KJ,whatistheefficiencyofseparationprocess?A0.1B0.11C0.0909D0.1111第2题Whichofthefollowingisacorrectequationforentropybalance?A∑outofsystem

(nS+Q/Ts)–∑insystem

(nS)=0B∑outofsystem

(nS+Q/Ts)–∑insystem

(nS+Q/Ts)=ΔSrC∑outofsystem

(nS)–∑insystem

(nS+Q/Ts)=ΔSrD∑outofsystem

(nS+Q/Ts)–∑insystem

(nS+Q/Ts)=0第3题Foridealgas,howisthemolarvolumecalculated?ART/VBRT/nCRT/PDRT/np第4题HCrepresentsfor:AHydrocarbonsBPolarorganiccompoundsCLightgasesDAqueoussolutions第5题P-υ-Tequation-of-statemodelssuchasR-K,S-R-K,P-Rareusedfornonidealmixturescontainingnonpolarcomponents.第6题Henry'slawforestimatingK-valuesforVapor-liquidequilibriaisK=Ps/P第7题Raoult‘slawisrecommendatedtobeappliedinidealsolutionsatnear-ambientpressure第8题Availabilityisameasureoftheminimumamountofenergyconvertedintoshaftwork.第9题Thebiggerthelostwork,thegreateristheenergyinefficiency.Chapter3Practice第1题Whichdiffusionoccurswhenturbulentmotionisthere?AMolardiffusionBEddydiffusionCChargediffusionDNodiffusion第2题WhichstatementisNotCorrectforbinarysysteminEMD?AN=0BNA=NBCNA+NB=NDNA+NB=0第3题WhichstatementisNotCorrectforbinarysysteminUMD?AN=NA+NBBN=NACNB=0DNA=0第4题Masstransferinordinarydiffusionoccursduetotemperaturegradient第5题Themolarfluxofanindividualspeciesisthesumofallthreemechanisms第6题Agitatingthefluidcannotenhancetheseparation第7题InEMD,thediffusivityofAtoBisequaltothediffusivityofBtoA第8题WhatismorelikelytobethepossiblevalueforthediffusivityofgasA0.1B10^-9C10^-20D10^-11第9题Consideranitrogenandoxygenmixture,thediffusivityofnitrogentooxygenat2atmand45degreeis

2*10^-5m2/s,whatisthevalueofthediffusivityofnitrogentooxygenat1atmand25degree?A1.05*10^-5m2/sB3.57*10^-5

m2/sC2*10^-5m2/sD1.43*10^-5m2/sChapter4Practice第1题Whatarethedegreesoffreedomiftherearetwocomponentsintwophases?A0B2C4D6第2题WhichoneisnotIntensiveVariable?ATemperatureBPressureCMolefractionDMolarflowrate第3题Phase-transitiontemperaturescannotbedeterminedusingT-y-xdiagrams第4题Whatistheboilingpointofmethanolinmethanol-watersystem?A100ºCB

64ºCC74ºCD54ºC第5题FigureshowstheT-y-xdiagramofthemethanol-watersystemat1atm.Consideramixtureof40mol%ofmethanolatroomtemperature,Whatisthebubblepointtemperature?A88ºCB70ºCC100ºCD75ºC第6题Iny-xplotofbinaryvapor-liquidmixture,ifthevaporizationpercentageis60mol%,thentheslopeoftheq-lineis?A-2/3B-0.6C2/3D0.6第7题Theplaintpointinequilateral-triangulardiagrammeansthetwoliquidphaseshavetheidenticalcompositions.第8题Itispossibletoseparateasolidphasecompletelyfromaliquidphasecauseitiseasytoachieveequilibrium.第9题whentheraffinateandextractarebothdiluteinthesolute,

activitycoefficientsofthesolutecanbetakenasconstantatagiventemperature.Chapter5Practice第1题GivedegreesofFreedomforthefollowingseparationunit:AND=2C+6BND=2C+5CND=3C+6DND=2C+8第2题Whatisamembranemodule?AAmembranemoduleisarepresentationofthetypeofporesinamembraneBAmembranemoduleisaunithousingthemembraneCAmembraneisrepresentationofanidealmembraneDAmembranemoduleisrepresentationoftheconcentrationchangesduringseparation第3题Acocurrentcascadeofequilibriumstagesforliquid-liquidextractionhasnomeritotherthantoprovideincreasedresidencetime.第4题Asinglephasestream,foreachstream,allvariables=C+3,thethreestandfortemperature,pressureandtotalflowrate第5题Inaidealcountercurrent,single-sectioncascadeforaleachingorwashingprocess,pureliquidsolvent,CcandissolvebothAandBcompletely第6题Whichoneisnotthecorrectdescriptionofsinglesection,liquid-liquidextractioncascade?AAcocurrentcascadeofequilibriumstageshasnomeritotherthantoprovideincreasedresidencetimeBCompleteextractioncanbeachievedincrosscurrentcascadeCThecountercurrentcascadeisthemostefficientofthethreelinearcascadesDAllthreepossibleliquid-liquidextractioncascadesassumethatforsolute,B,dissolvedincomponentsAandC,whicharemutuallyinsoluble第7题WhichoneistheCORRECTdescriptionofsinglesection,acountercurrentsolid-liquidcascade?ATheflowrateofsolventleavingintheoverflowfromstage2toNisSBTheflowrateofsolventleavingintheoverflowfromstage1toNisSCTheflowrateofsolventleavingintheoverflowfromstage2toNisRFADTheflowrateofsolventleavingintheunderflowfromstage1isS-RFA第8题Assumethat4,536kg/hofa25wt%solutionofp-dioxaneinwater

istobeseparatedcontinuouslybyusing6,804kg/hofpurebenzene.Thedistributioncoefficientforp-dioxane:Assumingthatbenzeneandwateraremutuallyinsoluble,determinetheextractionfactor:AE=2.4BE=2.5CE=1.5DE=3Chapter6Practice第1题Absorbersarebestoperatedat(

)Pressureand(

)Temperature：Ahigh,highBhigh,lowClow,highDlow,low第2题WhichstatementisTRUEincomparisonoftypesoftrays?ATherelativecostofsievetraysisonlyhalfofthatofbubble-captrays.BTheefficiencyofsievetraysisthehighestCThevaporcapacityofbubble-captraysisthehighestDThepressuredropofvalvetraysisthelowest第3题WhichoneisNOTthecorrectreasonwhenpackedcolumnispreferred?AColumndiameter<2ft,height<20ftBCorrosiveservicesCHighpressuredropDHighliquidvelocities第4题Frothregimeandemulsionregimearetwoundesirableregimes第5题Thevaporcapacityofbubble-captraysisthehighest第6题InAbsorber,foragivensoluteconcentrationintheliquid,thesoluteconcentrationinthegas

()

theequilibriumvalue,thusprovidingadrivingforceformasstransferofsolutefrom(

)to(

)Aisgreaterthan;gas;liquidBissmallerthan;gas;liquidCisequalto;liquid;gasDisgreaterthan;liquid;gas第7题Fortheabsorber,theoperatinglineis(

)theequilibriumlineAaboveBbelowCcoincidewithDcannotdecide第8题Theintersectionoftheoperatinglinewiththeequilibriumcurvesetstheboundaryforminimumabsorbentflowrate第9题Indilutesolutions,IfV'=176.4𝑘𝑚𝑜𝑙/ℎ,

𝐾𝑁=0.57,and97%ofthesoluteisabsorbed,

whatistheopticalabsorbentrate?A80𝑘𝑚𝑜𝑙/ℎB97.5𝑘𝑚𝑜𝑙/ℎC176.4𝑘𝑚𝑜𝑙/ℎD146.2𝑘𝑚𝑜𝑙/ℎChapter7Practice第1题Whichtypeoffeedconditionshowninfigurefordistillationofbinarymixture?ADew-pointvaporfeedBSuperheatedvaporfeedCBubble-pointliquidfeedDSubcooledliquidfeed第2题Distillationdiffersfromabsorptionandstrippinginthatthesecondfluidphaseisusuallycreatedby(

)meansAThermalBMechanicalCPressureDConcentration第3题Technically,distillationisthemostmatureseparationoperation.第4题Goalofbinarydistillationwithtrayedtowersistoachieve:AxD≈1,xB≈1BxD≈1,xB≈0CxD≈0,xB≈0DxD≈0,xB≈1第5题Indistillation,thehighertheaveragevalueofrelativevolativity,theharderthedesiredseparation第6题Forasaturatedliquidfeed,theq-lineisvertical第7题TheMcCabe-Thielegraphicalmethodcanquicklydeterminethelimit,Nmin(totalreflux),becausewhenL=V,(

)=(

)=0AD,DBB,BCL,VDD,B第8题WhichstatementabouttheMcCabe-ThielegraphicalmethodfordistillationisNotCorrect?AOptimalfeedstagegivesthesmallestnumberofequilibriumstagesBAdistillationcolumncan

beoperatedattotalrefluxfortheexperimentalmeasurementoftrayefficiencyCBothrectifyingandstrippingoperatinglinescoincidewiththe45ºlinewithminimumrefluxratioDThefeedstageisoptimalwhenthetransferismadeafterahorizontallineofthestaircasepassesoverpointP.第9题Iftherefluxratio,R=1.59,theslopeoftheoperatinglinefortherectifyingsectionindistillationis:A-0.389B0.389C-0.614D0.614Chapter8Practice第1题WhichstatementisTRUEinHunter-Nashgraphicalmethodforsolvingliquid-liquidternarysystem？AS+F=R1+E2BCRn-1andEnareonthetriangulardiagramatthetwoendsofatielineDThepinchpointcorrespondstothepointPminlocatedattheminimumdistancefromRN第2题Extractionofacetone(A)fromwater(C)by1,1,2-trichloroethane(S)at25°C.Liquid-liquidextractionwithternarysystemismostconvenientlycarriedoutwithHunter-Nashtriangulardiagram.

Assumethefeedof800kgissolvent-freewhichcontaining25%ofacetone,thesolventSof200kgispure.ThemixingpointMcanbelocatedinthediagram.WhatistheratioofthelengthSM/thelengthofSF?

A0.8B0.2C0.25D4第3题ThepinchpointintriangulardiagramcorrespondstothepointPminwilllocate()AatthegreatestdistancefromRNBattheclosestdistancefromSCdependonwhetherallpinchpointslieontheraffinatesideortheextractsideDNoneofabove第4题WhichtypeofseparationtechologydidRomansapplytoproduceGoldusingmoltenlead?ALiquid-liquidextractionBLeachingCAdsorptionDDistillation第5题Thekeytoaneffectiveextractionprocessisthediscoveryofasuitablesolvent,whichshouldnotbe:AStableBInexpensiveCLowaffinityforthesoluteDEasilyrecoverable第6题Thepointiscalledthe(

)onmiscibilityboundaryinternaryliquid-liquidsystemwhenthetwoliquidphaseshaveidenticalcompositions.APinchpointBPlainpointCMixingpointDIntersectionpoint第7题Mechanicalagitationisnecessarytoincreaseinterfacialareaperunitvolumeand/ordecreasemasstransferresistancewhenthesurfacetensionislow第8题Pressurehaslittleeffectonliquid-liquidequilibrium第9题Rn-1

andEn

areonthetriangulardiagramatthetwoendsofatielineChapter9Practice第1题Ceramicmemb