[西安交通大學2019秋]專業(yè)英語（高起專）在線作業(yè)（全部答案）

1、【奧鵬】西交《專業(yè)英語》在線作業(yè)（全部答案）試卷總分:100得分:100第1題Resistsare()elements.A、passiveB、activeC、independentsourcesD、dependentsources正確答案:A第2題Anelectricheaterdraws10Afroma120Vline.Theresistanceoftheheateris().A、1200?B、120?C、12?D、1.2?正確答案:

2、C第3題Thealgebraicsumofallvoltagesaroundaloopis().A、zeroB、indefinitevalueC、sumofvoltagerisesD、sumofvoltages正確答案:A第4題ONOFFinfmationcanberepresentedby()signal.A、adigitalB、ananalogC、adiscreteD、acontrol正確答案:A第5題Theprocessquant

3、izingthecontinuousvaluesintoabinaryscaleiscalled().A、digitaltoanalogconversionB、digitaltodigitalconversionC、analogtodigitalconversionD、analogtoanalogconversion正確答案:C第11題Copperlossesare()lossesintheprimarysecondarywinding

4、softhetransfmerce.A、inductiveB、capacitiveC、resistiveD、reactive正確答案:C第12題()canprovideanasynchronouslinkbetweentwoacelectricpowersystemwithdifferentnominalfrequencies.A、TheHVDC(highvoltageDC)transmissionB、TheEHV(extrahighv

5、oltage)ACtransmissionC、TheACdistributionD、Generats正確答案:A第13題Thegeneratvoltagesareusuallysteppeduptothetransmissionvoltagelevelby().A、seriescapacitB、parallelreactsC、stepuptransfmersD、stepdowntransfmers正確答案:C第14題Theobjecti

6、veoftheoptimaleconomicoperationofpowersystemsis().A、tominimizethetotalproductioncostB、tomaintainfrequencyconstantC、tomaintainvoltagesconstantD、toensurebalancebetweengenerationload正確答案:A第15題Anyprotectionschemeconsistsbasi