电工基础试题.docx
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电工基础试题.docx
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电工基础试题
电工基础试题
(一)(BasicexaminationquestionsofElectricalEngineering
(1))
Thebasicquestionsofelectrician(a).Txttostayuplate,becausethecouragetoendtheday;stayinbedbecauseofthecouragetostarttheday.Afriendistoseethroughyouwhostillloveyou.Thenationalelectricalnetworkoperationoflow-voltagepartelectricianfoundationknowledgetheoryoflicensingexamreviewquestions
SomebloggersandInternetusersshouldbeinvitedtocollectelectricalknowledgereviewquestions,examination,testcentersandotherblogpublishedforuserstoborrow,electricalupgradepromotionexam,examcandidates,jobtrainingandexamination,recertificationexaminationofevidence,electricalnetworktheorytestworkpermitpeacelearningreference.
Basicknowledgeofelectricalelectricianisthefoundationofalltypes,thispaperselectedquestions,istheelectricianfoundationknowledgetestcontent,butalsoanimportantcontentoftheprimaryandintermediateelectricianjobtraining,thepromotionexamination.Familiarwithandmasterthebasicknowledgeofelectrical,allowsyoutofurtherexplorethemysteriesofelectricianordealwithallkindsofexaminationswithease,ease,relaxedandhappytofinishthework.(theanswerisonlyforreference,welcomethefriendslookingforcarp,whichmaybewrong)
From(andfamily)
Achoice
Thebasicunitofchargeis1.(C).
A.secondB.ampC.CoulombD.kg
Isequalto2.1amperes(B)a.
A.103B.106C.109D.102
3.auniformwirestretchedfor3timestheoriginallength,whiletheresistancetotheoriginal(Ctimes).
A.3B.1/3C.9D.1/9
The4.generationofseriesresonantcondition(C).
A.XL,XcB.XLXcC.XLD.<=XcXL=XcE.XL=Xc
Attheendofthe5.voltageno-loadlongHVtransmissionlines(B)endvoltage.
A.belowB.ishigherthanC.equaltoD.lessthanorequalto
6.powerthree-phasesymmetricalload,whichisbetweenthephaseangle(B).
TheA.linevoltageandlinecurrentB.phasevoltageandlinecurrent
TheC.linevoltageandphasecurrentandphasevoltagephasecurrentD.
7.whenthepowerfrequencyincreases,respectivelywithR,Lbulbseries,C3circuitinparallel,and(B)increasethebrightnessofthebulbseries.
A.RB.LC.CD.RandLE.RandC
8.oftheratedvoltageis220Vthelightbulbinthe110Vpowersupply,lightingpoweristheoriginal(B).
A.2B.4C.1/2D.1/4
9.theratedvoltageofthesametworesistorsareconnectedinseriesinthecircuit,theresistanceofheatresistance(B).
ThesameA.B.largeC.small
10.byusingtheprincipleofsuperpositioncalculationofcomplexcircuitisacomplexcircuittocalculatecircuit(A).
A.
SinglesupplyB.R,LD.C.largesmall
The11.circuitiscomposedofpowersupply,load,line(B).
A.B.C.generatorD.instrumenttransformerswitch
12.currentisformedbythedirectionalmovementofelectrons,accustomedto(D)directionalmovementdirectionasthedirectionofthecurrent.
A.B.C.N-SlefthandruleD.positivechargeE.negativecharge
13,thecurrentsizeofthecurrentintensitytorepresentitsvalueisequaltotheperunittimethroughtheconductorcrosssection(B)andalgebra.
A.B.electriccurrent(charge)thestrengthofthecurrentD.powerC.
Theresistanceofthe14.conductor,andtheconductorsectionlengthnotonlyrelevant,butalsowiththeconductor(D)on.
A.B.C.D.materialtemperaturehumidityrange
Thethreeelementsof15.alternatingcurrentisthemaximumfrequency(C).
A.B.C.D.theinitialphaseangleofphasevoltage
16.sinusoidalalternatingcurrenteffectivevaluesuchasmaximumvalue(D).
A.1/3B.1/2C.2D.0.7
17.resistanceresistancedoesnotchangewiththeappliedvoltageorcurrentsizeofthecall(C).
A.B.fixedresistorvariableresistorC.linearresistorD.nonlinearresistor
Resistanceof18.resistancechangewiththeappliedvoltageorcurrentsizeofthecall(D).
A.B.fixedresistorvariableresistorC.linearresistorD.nonlinearresistor
19.twoparallelwiresbycurrentsinthesamedirection,betweentheconductor(D).
A.B.C.eddycurrentmagneticfieldgeneratedrejectionD.attract
The20.conductorinthecurrent,moreclosetotheconductorsurface,(A),thisphenomenoniscalledtheskineffect.
ThegreatertheB.A.currentvoltagehigherC.highertemperatureresistanceisD.
21.powerthree-phasestarconnectionorloadlinevoltageisthevoltage(A)times,linecurrentandphasecurrent.]
A.3B.2C.1vvD.2
22.magneticinductioncurrentgeneratedbythe(C)alwaystrytochangeoriginalflux.
TheinfluenceofA.B.enhancedC.D.topreventdecay
23.inthethree-phasefourwiresystem,whenthethree-phaseunbalancedload,three-phasevoltageequal,neutralcurrent(B).
A.B.isnotequaltozeroisequaltozerotheincreaseofC.D.decreases
24.voltageonthecapacitorincreasingprocessisanelectricfieldinthecapacitor,inthisprocess,itabsorbenergy(C).
A.B.C.D.powercapacitorharmonicinductance
25.inR,L,Cseriescircuit,compleximpedanceZ=(D).
.r2+l2+c2b.(r2+l2)ccd.
26.串联谐振是指电路呈纯(a)性.
a.电阻b.电容c.电感d.电抗
27.电容器在直流稳态电路中相当于(b).
.短路b.开路c.高通滤波器d.低通滤波器
28.半导体的电阻随温度的升高(c).
.不变b.增大c.减小
29.电场力做功与所经过的路径无关,参考点确定后,电场中各点的电位之值便惟一确定,这就是电位(c)原理.
.稳定b.不变c.惟一性d.稳压
30.串联电路中,电压的分配与电阻成(a).
.正比b.反比c.1:
1to2:
1.
31.并联电路中,电流的分配与电阻成(b).
.正比b.反比c.1:
1to2:
1.
32.线圈中感应电动势的放行可以根据(c)定律,并应用线圈的右手螺旋定则来判定.
.欧姆b.基儿霍夫c.楞次d.戴维南
33.在纯电感电路中,没有能量消耗,只有能量(c).
.变化b.增强c.交换d.补充
34.磁通的单位是(b).
a.b.wbc.t.d.mband.f
35.串联电路具有以下特点(c).
.串联电路中各电阻两端电压相等b.各电阻上分配的电压与各自电阻的阻值成正比.
c.各电阻上消耗的功率之和等于电路所消耗的总功率d.流过每一个电阻的电流不相等
36.电容器并联电路有如下特点(a).
in每个电容两端的电流相等.并联电路的等效电容量等于各个电容器的容量之和b.
c.并联电路的总电量等于最大电容器的电量d.电容器上的电压与电容量成正比
37.对称三相电势在任一瞬间的(d)等于零.
.频率b.波形c.角度d.代数和
38.互感电动势的方向不仅取决于磁通的(d),还与线圈的绕向有关.
.方向b.大小c.强度d.零增减
39.导线和磁力线发生相对切割运动时,导线中会产生成衣电动势,它的大小与()有关.
.电流强度b.电压强度c.方向d.导线有效长度
40.
Theelectricforceinunittimeiscalledpower(C).
A.powerB.powerC.electricpowerD.powerconsumption
TheaccuracyofD41.currenttransformerisusedtoconnect(C).
A.measuringinstrumentB.indicatorD.microcomputerprotectioninstrumentC.differentialprotection
Avoltagetransformerwinding42.turns(B)twotimesthenumberofwindings.
A.ismorethanB.fargreaterthanC.andlessthanD.farlessthan
43.intherectifiercircuit(C)outputDCripple.
A.single-phasehalfwaverectifierB.three-phasefullwaverectifierC.three-phasebridgerectifierD.single-phasebridgerectifier
Inthe44.plusrectifierfiltercapacitor,diodeconductionis1800(B)
A.isgreaterthanB.andlessthanC.
The45.transistorbasefunction(B)carrier.
A.B.C.collectionD.emissioncontrolamplifier
46.NPN,PNPtriodeamplification,theemitter(B).
A.reversevoltageB.withforwardvoltageC.NPNtubeandPNPtubewithforwardvoltage,reversevoltage.
D.PNPtubeandNPNtubewithforwardvoltage,reversevoltage
The46.methodistosolvethecutoffdistortionamplifier(C).
TheincreaseofA.partialresistanceB.decreasesRCC.reducethecollectorresistancebiasresistorD.increasesthelowerresistance
Thecontrolsignalof47.bipolartransistorandfieldeffecttransistor(C)for.
A.voltageB.currentC.bipolarvoltage,currentfieldeffect
D.bipolarcurrenttovoltage,fieldeffect
48.three-phaseloadresistancehalfwavecontrolledrectifiercircuitwiththecontrol,whentheangleisgreaterthan(D),theoutputcurrentintermittentstart.
A.300B.450C.600D.900
ForwardACresistance49.semiconductordiodewithpositiveDCresistanceoftwosizerelations(C).
A.B.C.isassmallasbigastheformerthanthelattertheformerthanthelatterinsmallD.
50.highinputimpedance,lowoutputimpedanceoftheamplifier(B).
A.commonemitteramplifierB.emitterfollowerC.commonbaseamplifier
Isthemaincharacteristicsof51.diodes(C).
A.rectifierB.regulatorC.unidirectionalconductionD.reversebreakdown
52.attheoutputendoftherectifiercircuitandacapacitor,mainlyusingcapacitance(C)characteristics,theripplevoltagebecomesmorestable.
A.voltagemutationofB.filterC.D.boostchargedischarge
Generallayoutof53.electricalbuildingonthemaptobeaccurateto(A)
A.
厘米B.毫米C.微米D.分米
54.建筑电气安装图一般用(b)表示.
A.B.C.D.大样图三维立体图立面图平面图
55.接线较复杂的图中,导线连接用中断线表示,通常采用()编号法.
A.B.C.D.逻辑顺序相对绝对
56.电气图中,凡尺寸单位不用(b)的必须另外注明.
A.B.C.D.分米微米厘米毫米
57.在无特殊要求的情况下,印刷板布线图中尺寸数字的单位为(b).
A.B.C.D.分米微米厘米毫米
58.并列运行的变压器其容量之比一般不超过(c).
A1:
1:
1,B2C3:
1D.4:
1
59.为防止分接开关故障,应测量分接开关接头阻值,其相差不超过(d).
A.B.C.,0.5%,1%,2%and1.5%d.
60.油浸变压器在正常情况下为使绝缘油不致过速氧化,上层油温不宜超过(b)℃.
A.B.C.D.105,95,85,75
61.变压器绝缘自投入运行后,在允许条件下运行,其寿命可达(b)年.
A.B.C.D.10~1515~2025~3020~25
62.变压器运行中的电压不应超过额定电压的(c).
A.B.C.±2.0%±2.5%±5%d.±10%
63.Y/yn0连接的变压器,其中性线上的电流不应超过低压绕组额定电流的(d)%.
A.B.C.D.2515105
64.变压器在同等负荷及同等冷却条件下,油温比平时高(b)℃,应判断变压器发生内部故障.
A.B.C.D.2015105
65.当电网发生故障时,如有一台变压器损坏,其他变压器(c)过负荷运行.
A.B.C.D.允许1小时允许短时间不允许允许2小时
66.变压器的铁芯采用相互绝缘的薄硅钢片制造,主要目的是为了降低(c).
A.B.C.D.磁滞损耗涡流损耗杂散损耗铜耗
67.变压器并列运行时,变比相差不超过(b).
A.B.±0.2%±0.5%C.
1%+D+1.5%
68.powertransformershortcircuitvoltageistheratedvoltage(B).
A.2%to4%B.5%to10%C.11%to15%D.from15%to20%
69.inthepowersystemwith"kWh"astheunitofmeasurement(B)
A.voltageB.powerC.powerD.potential
70.whenthereferencepointchange,thepotentialdifferenceisacircuit(C).
A.bigB.smallC.doesnotchangeD.cannotbedetermined
71.anactualpowersupplyvoltagedecreaseswiththeloadcurrent(B).
A.decreas
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