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1、《水泵与水泵站》试题A参考答案"Pumpandpumpstation"examinationquestionsAreferenceanswersName,major,class,studentnumberQuestionnumber123456totalscoreGlossary(4items,eachitemof2.5points,atotalof10points):1.waterpumpstationThemulti-purposemultipurposemultipurposewatercontrolhubiscomposedofapump(apump,apowermachine,atr
2、ansmissiondevice),acomputerroom,apipeline,awaterinletandoutletstructure,anelectricpowersystem,etc..2.liftTheenergyobtainedfromtheinletofanpumptotheoutletofaunitofwater.3.shaftpowerInputpowerofpumpshaft.4.waterhammerForsomereason,adramaticchangeinthemovementofelementsinahydraulicmachineryorpipe.There
3、are20emptyquestions(0.5pointsperempty,10points):1.vanepumpcanbedividedintocentrifugalpump,axialpump,mixedflowpump.Thecentrifugalpumpworksbypumpingthecentrifugalforceproducedbythehigh-speedrotationofabladedimpellerwithvanes.2.themainpowerofthewaterpumphaseffectivepower,shaftpower,matchingpower.3.,the
4、waterpumpcavitationdamagetotheperformanceofthewaterpumpworse,sothattheover-currentcomponentsdamaged,Generatenoiseandvibration,shortentheservicelifeoftheunit.4.axialflowpumpshallbestartedwithopenvalve,andcentrifugalpumpshallbeoperatedbywayofoffvalve.5.,accordingtoitsstructuraltype,thepumphousecanbedi
5、videdintosubbasetype,drychambertype,wetchambertypeandblocktype.6.thelayoutofthepressurepipeisarrangedinparallelarrangement,radialarrangement,parallelarrangementandseriesarrangement.Singlechoice(oneoffour,everyday1points,atotalof10points)TheoperatingpowerofacentrifugalpumpunitisN,andtheflowrateisredu
6、cedbyusingavariablevalve,andthepowerischangedfromNtoN.[A]AN(NBN(<=NCN>(NDN(morethanNTheleavesofcentrifugalpumpsaregenerallymadeof[C]A,rotatingparabolicB,twistedsurfaceC,columnarDsphericalWhenthevanepumpoperatesatacertainrevolution,thegreatertheunitweightofthefluiditispumping(theotherphysicalproperti
7、esofthefluidarethesame),anditsshaftpower[A]ThebiggertheB,thesmallertheC,andtheAconstant.DisnotnecessarilyThepumpspeed,pumpspeedcontrolbyEMBEDEquation.3toEMBEDEquation.3,therelationshipbetweentheflowof
