《机电专业英语》期末考试试卷a

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1、宿迁应用职业技术学院（校）2007—2008学年度第一学期《机电专业英语》期末考试试卷（试卷编号A）（闭卷100分钟）题号—••四/-/'<总分复核人实得分阅卷人:—.TranslationsofPhrasesandExpressions(2fX15=30Jheattreatmerrt2.roomtemperature3.rawmateriaI摇4.wormgear5.fIamecutterto躱6.cannedroutine7.asfaras..・beconcerned8.atthepointswhere9.bedividedby10

2、.atrightanglesto".inducedcurrent12.controIIedvarriabIe13.closedsystem14.action-one15.carbondioxide二・Calculations©'+10=15J1.HowmuchcurrentwiIIfIowthroughawhenvoltageof240VisappIied?24口electricheater2.AtransformersuppIiesaloadwithprimaryvoltageis2400V,find:(a)thesecondaryv

3、oltamperes;(b)theprimaryvoltamperes;And(c)theprimarycurrent.30Aat120V.Ifthe三.ReadingComprehensions(30r)IronandSteelTheearthcontainsaIargenumberusefuItoman.OneofthemostimportantofofmetaIswhicharetheseisiron・Modernindustryneedsconsiderablequantitiesofthismetal,eitherinthef

4、ormofironorintheformofsteel.Acertainnumberofnon-ferrousmetaIs,incIudingaIuminumandzinc,areaIsoimportant,buteventodaythemajorityofourengineeringproductsareofironorsteel.Moreover,ironpossessesmagneticproperties,whichhavemadethedeveIopmentofeIectricaIpowerpossibIe.Theironor

5、ewhichwefindintheearthisnotpure.11containssomeimpuritieswhichwemustremovebysmeIting.TheprocessofsmeItingconsistsofheatingtheoreinabIastfurnacewithcokeandIimestone,andreducingittometaI.BIastsofhotairenterthefurnacefromthebottomandprovidetheoxygenwhichisnecessaryfortheredu

6、ctionoftheore.Theorebecomesmolten,anditsoxidescombinewithcarbonfromthecoke.Thenon-metailieconstituentsoftheorecombinewiththeIimestonetoformaIiquidsIag.ThisfIoatsontopofthemoIteniron,andpassessoutofthefurnacethroughatap.Themetalwhichremainsispigiron.Wecanme11thisdownagain

7、inanotherfurnace—acupoIa—ithmorecokeandIimestone,andtapitoutintoaladleordirectlyintomouId.Thisiscast一iron.Cast-irondoesnothavethestrengthofstee1.11isbrittleandmayfractureundertension.ButitpossessescertainpropertieswhichmakeitveryusefuIinthemanufactureofmachinery.Inthemol

8、tenstateitisveryfluid,andthereforeitiseasytocastitintocompIicatedshapes.AIsoitiseasytomachineit.Cast-ir