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1、电气专业英语试卷一.中英文单词互译.(1’*25=25’)1．inductor2．sensor3．manufacture4．insulator5．conductor6．Current7．normallyopen8．voltage9．shaft10．switch11.磁场12．频率13．发电机14．速度15．二极管16．万用表17．继电器18．电池19．加速度20．齿轮21．三极管22．硅23．电阻24．电容25．晶体二．根据英文词组，写出中文意义（2’*10=20’）ontheotherhand takeadvanta
2、geof negativecharge electricfield freeelectron currentflow sinewave seriescircuit parallelcircuit PNjunction 三．英文翻译成中文(3’*10=30’)1.Pressstartpushbutton.Circuitiscompletedwhenthenormallyopenpushbutton(PB)ismomentarilyclosed.2.Currentflowsfromvoltagesource,through
3、normallyclosedstopPB,throughstartPB,throughthecontactorcoil,totheothersideofthevoltagesource.3.Thisenergizesthecoilandcausesallcontactstoclose4.Contactsclose.MotorwillstartsinceACvoltageisappliedthroughthecontactsdirectlytothemotor.5.Theholdingcontactcausethecur
4、rentpaththroughthecoiltobecompletedafterthestartPBisreleased.6.Motorwillrun.7.Pressstoppushbutton.8.ThecurrentpathisopenedbymomentarilyopeningthenormallyclosedstopPB.9.Thecoildeenergizes,causingthecontactstoopen.10.Motorwillstop.四．根据英文缩写，写出英文完整形式及中文意思（2’*5=10’）英
5、文完整形式中文意思PLC AC CNC DC FMS 五.根据下列短文填空（1’*10=10’）Forcesbetweentwoelectrically-chargedobjectscanbeextremelylarge.Mostthingsareelectricallyneutral;theyhaveequalamountsofpositiveandnegativecharge.Ifthiswasn’tthecase,theworldweliveinwouldbeamuchstrangerplace.Wea
6、lsohavealotofcontroloverhowthingsgetcharged.Thisisbecausewecanchoosetheappropriatematerialtouseinagivensituation.Metalsaregoodconductorsofelectriccharge,whileplastics,wood,andrubbersarenot.Theyarecalledinsulators.Chargedoesnotflownearlyaseasilythroughinsulatorsa
7、sitdoesthroughconductors,whichiswhywiresyouplugintoawallsocketarecoveredwithaprotectiverubbercoating.Chargeflowsalongthewire,butnotthroughthecoatingtoyou.Materialsaredividedintothreecategories,dependingonhoweasilytheywillallowcharge(i.e.,electrons)toflowalongthe
8、m.Theseare:·conductors-metals,forexample·semi-conductors-siliconisagoodexample·insulators-rubber,wood,plasticforexampleMostmaterialsareeitherconductorsorinsulators.Th
