電機(jī)與變壓器英語(yǔ)練習(xí)題一、詞匯填空1.The___________isadevicethatconvertselectricalenergyintomechanicalenergy.2.A___________isanelectricaldevicethatchangesthevoltageofanalternatingcurrent.3.The___________ofamotoristherotatingpartthatconvertselectricalenergyintomechanicalenergy.4.The___________ofatransformeristheratioofthenumberofturnsinthesecondarycoiltothenumberofturnsintheprimarycoil.5.___________istheprocessofreducingthevoltageofelectricalpowerfordistribution.二、選擇填空1.WhichofthefollowingisNOTatypeofmotor?A.DCmotorB.ACmotorC.TransformerD.Inductionmotor2.Theprimaryfunctionofatransformeristo:A.IncreasevoltageB.DecreasevoltageC.ConvertACtoDCD.Storeelectricalenergy3.Inathreephasemotor,thenumberofpolesisdetermined:A.ThefrequencyofthepowersupplyB.ThevoltageofthepowersupplyC.ThespeedofthemotorD.Thetypeofmotor4.Theslipofaninductionmotoris:A.ThedifferencebetweensynchronousspeedandactualspeedB.TheratioofactualspeedtosynchronousspeedC.TheratioofsynchronousspeedtoactualspeedD.Thedifferencebetweenratedspeedandactualspeed5.Whichofthefollowingisatypeoftransformercoolingmethod?A.AircoolingB.WatercoolingC.OilcoolingD.Alloftheabove三、閱讀理解Passage:1.Whatisthemainfunctionofamotor?2.Whatarethetwomaintypesofmotors?4.WhyareACmotorswidelyusedinindustrialandresidentialsettings?四、翻譯1.變壓器是一種靜止的電氣設(shè)備，用于在兩個(gè)或多個(gè)電路之間傳輸交流電能。2.電機(jī)的工作原理是基于電磁感應(yīng)現(xiàn)象。3.三相異步電動(dòng)機(jī)因其結(jié)構(gòu)簡(jiǎn)單、運(yùn)行可靠、維護(hù)方便等優(yōu)點(diǎn)而得到廣泛應(yīng)用。4.變壓器的效率通常高于95%，因此在電力系統(tǒng)中具有很高的經(jīng)濟(jì)價(jià)值。5.電動(dòng)機(jī)的起動(dòng)方式有直接起動(dòng)、星角起動(dòng)和自耦變壓器起動(dòng)等。五、完形填空1.A.powerB.voltageC.currentD.speedMotorstartersaredevicesthatprotect__2__duringthestartingphase.Theycanlimittheinrushcurrentthatoccurswhenamotorisfirstturnedon,whichcanpreventdamagetothemotorwindingsandreducethestressontheelectricalsystem.2.A.motorsB.transformersC.circuitsD.starters3.A.directonline(DOL)B.stardeltaC.autotransformerD.softstarterInastardeltastarter,themotorstartsina__4__configurationandthenswitchestoadeltaconfigurationonceitreachesacertainspeed.Thismethodreducesthestartingcurrentandprovidesasmoothtransitiontofullspeedoperation.4.A.starB.deltaC.wyeD.seriesFormotorsthatrequirefrequentstartingandstopping,__5__startersareoftenused.Thesestartersaredesignedtohandlethewearandtearassociatedwithfrequentoperation.5.A.DOLB.stardeltaC.autotransformerD.inversetime六、段落匹配Matchthefollowingdescriptionswiththecorrectterms.Eachtermcanbeusedonlyonce.A.InductionMotorB.SynchronousMotorC.TransformerD.RectifierE.Inverter1.Amotorwhosespeedissynchronizedwiththefrequencyofthepowersupply.2.AdevicethatchangestheACvoltagetoadifferentACvoltagelevel.3.Amotorthatoperatesbasedontheprincipleofelectromagneticinduction.4.AdevicethatconvertsACpowertoDCpower.5.AdevicethatconvertsDCpowertoACpower.七、句型轉(zhuǎn)換1.Theefficiencyofatransformerisusuallyhigherthan95%.(改為一般疑問(wèn)句)3.Theprimaryfunctionofatransformeristochangethevoltageofanalternatingcurrent.(改為否定句)4.Motorsconvertelectricalenergyintomechanicalenergy.(改為反義疑問(wèn)句)5.Propermotorcontrolcanincreasethelifespanofthemotor.(改為比較級(jí))八、寫作Writeashortparagraph(about5070words)ontheimportanceofregularmaintenanceforelectricalmotors.Includereasonswhymaintenanceiscrucialfortheefficientoperationofmotors.答案一、詞匯填空1.motor2.transformer3.rotor4.turnsratio5.voltagetransformation二、選擇填空1.C2.A3.A4.B5.D三、閱讀理解1.Themainfunctionofamotoristoconvertelectricalenergyintomechanicalenergy.2.ThetwomaintypesofmotorsareDCmotorsandACmotors.4.ACmotorsarewidelyusedinindustrialandresidentialsettingsduetotheirreliabilityandefficiency.四、翻譯1.ThetransformerisastaticelectricaldeviceusedtotransferACelectricalenergybetweentwoormorecircuits.2.Theworkingprincipleofthemotorisbasedonthephenomenonofelectromagneticinduction.3.Threephaseasynchronousmotorsarewidelyusedbecauseoftheirsimplestructure,reliableoperation,andconvenientmaintenance.4.Theefficiencyoftransformersisusuallyhigherthan95%,makingthemhighlyvaluableinpowersystems.5.Motorstartingmethodsincludedirectstarting,stardeltastarting,andselfcoupledtransformerstarting,amongothers.五、完形填空1.B2.A3.B4.A5.C六、段落匹配1.B.SynchronousMotor2.C.Transformer3.A.InductionMotor4.D.Rectifier5.E.Inverter七、句型轉(zhuǎn)換1.Istheefficiencyofatransformerusuallyhigherthan95%?3.Theprimaryfunctionofatransformerisnottochangethevoltageofadirectcurrent.4.Motorsconvertelectricalenergyintomechanicalenergy,don'tthey?5.Propermotorcontrolcanincreasethelifespanofthemotormoreefficiently.八、寫作Regularmaintenanceisessentialfortheefficientoperationofelectricalmotors.Itensuresthatmotors