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1、试题,发电厂动力部分自考试题,笔记(Testquestions,powerplants,selftestquestions,notes)January2008nationalhighereducationselfstudyexaminationPowerunittestinpowerplantCourseCode:02311Asinglechoice(thetitleof15items,eachitemof1points,atotalof15points)Inthefouroptionofeachitemlistedinonlyoneisinlinewiththere
2、quirementsofthesubject,pleasefillinthecodeinquestionafterthebrackets.Thewrongchoiceornot,choosenopoints.1.,thepowerequipmentthatconvertsheatenergyintomechanicalenergyis()A.boilerB.condenserC.turbineD.generatorThe3.Rankinecyclefluidinwatervapor,completeadiabaticexpansionprocessequipment(
3、is)A.boilerB.turbineC.condenserD.superheater4.inthecaseofaknownfluidspecies,thefluidPrandtlnumberisfoundinthephysicaltable,basedmainlyon()A.pressureB.temperatureC.velocityD.pipediameter5.theutilitymodeladoptstheformofapulverizedcoalboiler,andthecombustionmodebelongsto()A.layerfurnaceB.b
4、oilingfurnaceC.chambercombustionfurnaceD.cyclonefurnace6.thefollowingstatementaboutswirlburnersiswrongA.longrangeB.hasaninternalpressurereturnzoneC.largeexpansionangleD.hastangentialvelocity7.thefollowingstatementaboutwaterfilmdustcollectoriswrongA.dustremovalefficiencyislowB.smokecircu
5、lationresistanceisbigC.dustcollectoriscompactinstructureandsmallinsizeD.initialinvestmentislarge8.,inthemanyfactorsthataffecttheboileroperatingconditions,belongsto"outsidedisturbance"is()A.coalqualitychangeB.excessairfactorchangeC.coalfinenesschangeLoadchangeofD.turbogeneratorunit9.thee
6、nergyconversionofsteaminthehighpressurecylinderofamultistageturbineisinaseriesofProgressivelycompletedintheseriesofA.stagesB.inseriesatthesametimeTheC.iscompletedinparallelD.parallelstagesarecompletedsimultaneously10.whenthesteamtemperatureisconstantandthepressurerises,thesteamattheendo
7、ftheturbine()A.temperaturedropB.temperatureriseC.humiditydecreasesD.humidityincreases11.theroleoftheejectorinthecondenseroftheturbineistodrawoutthecondenserA.airB.steamC.steamandairmixtureD.airandothernoncondensablegases12.aunitwithalargerateofchangeinturbinespeedundercertainlo