經(jīng)典word整理文檔，僅參考，轉(zhuǎn)Word此處可刪除頁(yè)眉頁(yè)腳。本資料屬于網(wǎng)絡(luò)整理，如有侵權(quán)，請(qǐng)聯(lián)系刪除，謝謝！5.InalternatingcurrentanACgeneratorisusedtomakeelectronsflowcontinuouslyinonedirection._____西安交通大學(xué)現(xiàn)代遠(yuǎn)程教育考試卷成績(jī)6.InChinaalternatingcurrentisusuallygeneratedat60Hz._____7.Thenorthpoleofthearmatureisattractedtothesouthpoleofthemainfield.Thesouthpoleofthearmatureisattractedtothenorthpole課程:專業(yè)英語(yǔ)ofthemainfield._____專業(yè)班號(hào)考試日期年月日8.Whenthreecapacitorsconnectedinseries,._____CCCCtotal123姓名學(xué)號(hào)期中期末9.Thecommutatorcanchangecurrentdirectionintheconductor._____一．10分，每空1分）1.thestandardmeasureofelectricalpower____________2.anelectricgeneratorthatproducesalternatingcurrent__________10.Mostcomputersareequippedwithakeyboardastheprimaryoutputdevice._____3.twopiecesofwirewereconnectedendtoend4.twopiecesofwirewereconnectedsidebyside________________________三.15分，每題1.5分）ratedarmaturecurrent____________1.____________2.理想電源5.thestandardunitofmeasurementforstrengthofanelectricalcurrent____________3.____________4.周期電流circuitparameters____________6.adeviceusedtobreakoropenanelectriccircuitortodivertcurrent5.____________6.直軸negativefeedback____________fromoneconductortoanother____________7.adevicethatgenerateslight,heat,ortherapeuticradiation____________7.有功電流分量8.____________9.電網(wǎng)____________reactivecurrentcurrent____________8.amaterialthatinsulates,especiallyanonconductorofsound,heat,orelectricity____________10.____________digitalrelays9.oforrelatingtoasystemofnumerationhaving2asitsbase____________四.30分，每空1分）1.Resistorsare_____elements.10.thestandardunitofelectricalresistance____________A.passiveB.activeC.independentsourcesD.dependentsources二.10分，每空1分）2.Anelectricheaterdraws10Afroma120Vline.Theresistanceoftheheateris_____.1.InalternatingcurrentanACgeneratorisusedtomakeelectronsflowA.1200?B.120?C.12?3.Thealgebraicsumofallvoltagesaroundaloopis_____.D.1.2?continuouslyinonedirection._____2.InNorthAmerican50Hzisadoptedasstandardfrequencyinelectricpowersystem._____A.zeroC.sumofvoltagerisesB.indefinitevalueD.sumofvoltagedrops3.Acomputer’smicroprocessoronlyunderstandshigh-levellanguage._____4.ON-OFFinformationcanberepresentedby_____signal.A.adigitalC.adiscreteB.ananalogD.acontrol4.Instructionswritteninahigh-levellanguagemustbetranslatedintomachinelanguageinbinaryformbeforeacomputercanusethem._____第1頁(yè)共6頁(yè)第2頁(yè)共6頁(yè)5.InNorthAmerican_____isadoptedasstandardfrequencyinelectricpowersystem.14.Delphibelongsto_____.A.low-levelprogramminglanguageA.25HzB.50HzC.60HzD.125Hz6._____canprovideanasynchronouslinkbetweentwoacelectricpowersystemwithdifferentnominalfrequencies.A.TheHVDC(highvoltageDC)transmissionB.TheEHV(extra-highvoltage)ACtransmissionC.TheACdistributionB.high-levelprogramminglanguageC.aprogramminglanguageconnectedwiththecomputerhardwarebehaviorD.anassemblylanguage15.Afloppydiskdriveis_____devicethatreadsdatafromandwritesdatatofloppydisks.A.aninputB.anoutputD.Generators7.Thegeneratorvoltagesareusuallysteppeduptothetransmissionvoltagelevelby_____.C.astorageD.adataprocessing16.Inacoal-firedpowerplant,anelectrostaticprecipitatorisusedtoremove_____fromthecombustiongases.A.seriescapacitorB.parallelreactorsC.step-uptransformersD.step-downtransformers8.AD/Aisadevicethatcanconvertadigitalsignaltotheequivalent_____.A.solidparticleB.C.COD.watervapour217.Incogeneration（熱電聯(lián)產(chǎn)，熱電聯(lián)供）systems,theoverallenergyefficienciesareraisedby_____.A.digitalformB.numericalformA.importantthecombustionprocessC.binaryformD.analogformB.providingthermalenergytothecustomersC.raisingthesteamtemperature9.TheprecisionofADC(analog-to-digitalconversion)isdeterminedby_____.D.reducingemissionsA.itsspeedB.itsgain2C.theaccuracyofthereferencevoltageD.thenumberofbinarybits18.Thehydropoweriswellsuitedforswitchingaccordingto_____commandtomeetchangingpowerneeds.10.Whenaninductionmotorwith10polesissuppliedby50Hzthree-phaseacpowersource,thesynchronousrevolutionsperminuteis_____.(Synchronousr/min=120f/p)A.aconsumer’sB.auser’sC.adispatcher’sD.anoperator’sincascadeis_____.19.ThetotaltransferfunctionforandGs1Gs2A.1000B.900C.700D.60011.Acomputerprinteris_____devicethatproducescomputer-generatedtextorgraphicalimagesonpaper.A.B.C.D.Gs1Gs2GsGs1GsGs212A.aninputB.anoutputC.astorageD.adataprocessing20.Thesystem’scharacteristicequationcanbeusedtodetermine_____ofalineartime-invariantsystem.12._____carriesdataouttospeakersandheadphones,orbackfromamicrophone.A.thestabilityB.magnitudeofthesteady-stateerrorC.thecontrollabilityD.theobservabilityA.AgraphicscardB.Amodem21.TheBuck（降壓式變換器）isa_____converter.B.currentstep-downD.resistanceC.AnetworkcardD.AsoundcardA.voltagestep-upC.currentstep-up13.Acomputer’smicroprocessoronlyunderstands_____inbinaryform.A.high-levellanguagesB.machinelanguageC.humanlanguagesD.assemblylanguage22.Afrequencyresponseisafunctionofthevariable_____.A.B.C.D.jDst第3頁(yè)共6頁(yè)第4頁(yè)共6頁(yè)Ifthesecondaryhasfewerturnsthantheprimary,thetransformeriscalledastep-downtransformerinwhichtheACvoltageofthesecondarywindingislowerthanthatappliedtotheprimarywinding.Inawell-builttransformertheproductofthesecondaryvoltagemultipliedbythesecondarycurrentisalmostequaltotheproductoftheprimaryvoltagetimestheprimarycurrent.23.Theunitoflogarithmofthemagnitudeofatransferfunctionis_____.B.directcurrent,directcurrent2.Noiseisprobablytheonlytopicinelectronicsandtelecommunicationwithwhicheveryonemustbefamiliar,nomatterwhathisorherspecialization.Itiseverpresent,andlimitstheperformanceofvirtuallyeverysystem.Also,themeasurementofitisverycontentious,withalmosteverybodyhavingadifferentpetmethodofquantifyingitanditseffects.C.alternatingcurrent,alternatingcurrentD.alternatingcurrent,alternatingcurrent25.Theprimarywindingisconnectedto_____.A.thepowersourceB.theloadC.themeasurementinstrumentD.themotor26.Copperlossesare_____lossesintheprimaryandsecondarywindingsofthetransformercore.六.15分，每題3分）1.我們將大規(guī)模發(fā)展電力工業(yè)。2.這臺(tái)發(fā)動(dòng)機(jī)一直運(yùn)轉(zhuǎn)良好。A.inductiveC.resistiveB.capacitiveD.reactive3.電流在電路中流動(dòng)的速度是非常快的。4.如果使用變壓器，低電壓的電力就能轉(zhuǎn)換成高電壓的電力。5.這一現(xiàn)象我們稱之為電磁感應(yīng)。27.Therelationresultsin_____.AAA.nullB.identityC.indefinitevalueD.zero28.Thenotebookcomputersuse_____assta