春季學期電機與拖動基礎題庫

1、Wewillcontinuetoimprovethecompanysinternalcontrolsystemsteadyimprovementinabilitytomanagecontroloptimizebusinessprocessestoensuresmoothprocessesresponsibilitiesinplacetofurtherstrengtheninternalcontrolsplayacontrolpostin

2、dependentoversightroleofevaluationcomplyingwiththirdpartyresponsibilitytoactivelymakeuseofinternalaudittoolsdetectpotentialmanagementstreamlinestardizerelatedtransactionsstrengtheningoperationsinaccdancewithlaw.Deepening

3、theinfmationmanagementtoensurefullcommunication“zeroresistance“.ToconstantlyperfectERPBFSPIMISSCMinfmationsystembasedconstructionfullintegrationinfmationsystemachievedinfmationresourcessharedtoexpPtalsystemapplicationofb

4、readthdepthplayinfmationsystemonenterpriseofAssistantroletoperfectdailyrunmaintenanceoperationofrecdspromoteproblemreasonsanalysissystemhovertostrengtheningBFSERPSCMtechnologyapplicationoftrainingimproveemployeesapplicat

5、ioninfmationsystemofcapacitylevel.Humanisticcaretoensure“zero.“TostrengtheningHumanitiescarecontinuestofostercompanywindcleargasareheartShunofcultureatmospherestrengtheninglovehelpedtrappedcaredifficultemployeescarriedou

6、tstyleactivitiesrichemployeeslifestrengtheninghealthlabourprotectionganizationcareerhealthmedicalcontrolcareeragainstcontinuestoimplementationpsychologicalwarningpreventionsystemtrainingemployeeshealthofacterstableofmood

7、enterprisingofattitudecreatedfriendlyfraternityofHumanitiesenvironment.Tostrengthenriskmanagementensurethatthebusinessof“zerorisk“.Tostrengthenedbusinessplansmanagementwillbusinessbusinessplanscovertoalllevelensurethebus

8、inesscancontrolincontroltocloseconcernfinancialcoalelectriclinkageenergysavingschedulingnationalpolicytrendsstrengtheningtrackactiveshouldtoimplementationStateownedassetsmethodfurtherspecificationbusinessfinancialmanagem

9、enttoperfectrisktubecontrolsystemachievedriskrecognitionmeasureassessmentreptcontrolfeedbackofclosedringmanagementimproveriskpreventioncapacity.Tofurtherstardizetradingstrivetoachieve“accdingtolawstardizefair.“Innovation

10、ofperfmancemanagementtoensurethatpotentialemployees“zerofly“.Tostrengthenperfmancemanagementprocesscontrolenhanceemployeeevaluationlevelsofeffectivecommunicationtoimproveperfmancemanagement.Tofurtherquantifyrefineemploye

11、estards...Wkfullplaypartybranchmembersin“fivetypeEnterprise“constructionintheofcerolefightingftressrolepioneermodelroletocontinuestostrengthening“fourgood“l(fā)eadershipconstructionfullplaylevelscadresinenterprisedevelopment

12、intheofbackbonebackboneroletofullstrengtheningmembersyouthwkfullplayyouthemployeesincompanydevelopmentintheoffceroletoimproveindependentCommissionagainstcruptionwklevelstrengtheningonenterprisebusinesskeylinkofeffectiven

13、essmonited.maintainstability.Tofurtherstrengthenpublicityeducationimprovetheoveralllegalsystem.Wemuststrengthensafetymanagementestablishimprovetheeducationsupervisionevaluationasoneofthetrafficsafetymanagementmechanism.T

14、oconscientiouslysumuptheOlympicsecuritycontrolspromotingintegratedmanagementtoahigherlevelhigherstardsahigherlevelofdevelopment.EmployeestodayislunarcalendaronDecember24theoxBellisabouttoringatthistimeofyearweclearlyfeel

15、thepulseoftheXXpowergenerationcompanytoflourishtomeclearlyhearXXpowergenerationcompaniesmaturesymmetrybreathing.Recallingpastoneanotheracrossarailingweareenthusiasticfullofconfidence.Futuredevelopmentopptunitieswemeexcit

16、ingfightmespirited.Employeesletustogetheracross2013fullofchallengesopptunitiestocreateagreenlowcostoperationfullofhumanecareofawldclasspowergenerationcompanywkhard!TheoccasionoftheSpringFestivalmysincerewishthatyouthefam

17、iliesofthestaffinthenewyeargoodhealthhappyhappy春季《電機與拖動基礎》題庫春季《電機與拖動基礎》題庫一、填空一、填空1、直流發(fā)電機的工作原理是基于原理；而直流電動機的工作原理是基于。2、直流發(fā)電機電樞中感應電動勢的大小與、、有關。3、換向極繞組應與電樞繞組聯(lián)。4、直流電機的磁場是直流電機產(chǎn)生和必不可少的因素。5、直流電機的銅耗包括和兩部分。6、直流電動機常用的電氣制動方法有、、三種。9、并勵

18、直流電動機可以通過改變或來改變電動機的旋轉轉方向。10、直流電動機起動的方法有，和。11、直流電機的勵磁方式可分為、、和四種。12、電動機的飛輪力矩GD2越大，系統(tǒng)慣性，靈敏度。13、生產(chǎn)機械的負載特性大致可以分為、和。14、他勵直流電動機的固有機械特性是指在條件下，和的關系。15、如果不串聯(lián)制動電阻，反接制動瞬間的電樞電流大約是電動狀態(tài)運行時電樞電流的倍。16、直流電機的運行狀態(tài)是可逆的，可運行于狀態(tài)，也可運行于狀態(tài)。18、直流電機的

19、轉子是由、、、組成的。19、直流電動機的電樞電動勢Ea與外加電源電壓U1及電樞電流Ia方向，稱為，其作用。20、直流發(fā)電機電樞導體里流過的是電流，只是由于裝了和裝置，才能輸出流電。21、在磁通恒定情況下，直流電動機的轉矩大小與的大小成正比。22、變壓器的效率特性是指一次側二次側不變，變壓器的效率隨變化的規(guī)律，即。23、變壓器在運行時其損耗基本不變，隨負載的變化而變化，當?shù)扔跁r，效率最高。24、直流電動機是將能轉換成能，直流發(fā)電機是將能轉

20、換成能。25、直流發(fā)電機電樞導體中的電流是電流，電刷間的感應電動勢是的。26、單疊繞組電機的并聯(lián)支路對數(shù)等于，單波繞組電機的并聯(lián)支路對數(shù)等于。27、電力拖動系統(tǒng)由，，，四個組成部分。28、電力拖動系統(tǒng)穩(wěn)定運行的條件：在負載轉矩與機械特性的交點所對應的轉速之上保證，而在這一轉速之下則要求。29、當直流電動機的轉速超過時，出現(xiàn)回饋制動。30、調速與因負載的變化而引起的轉速變化是不同的，調速需電氣參數(shù)，使特性發(fā)生變化。31、變壓器空載試驗時輸

21、入的有功功率主要為，短路試驗時輸入的有功功率主要為。32、電壓互感器使用時副邊不允許，電流互感器使用時副邊不允許。33、確定感應電勢的方向用手定則，確定電磁力的方向用手定則。34、直流電機中，同時交鏈繞組和繞組的磁通叫主磁通。35、直流發(fā)電機的繞組常用的有和兩種形式。Wewillcontinuetoimprovethecompanysinternalcontrolsystemsteadyimprovementinabilitytoman

22、agecontroloptimizebusinessprocessestoensuresmoothprocessesresponsibilitiesinplacetofurtherstrengtheninternalcontrolsplayacontrolpostindependentoversightroleofevaluationcomplyingwiththirdpartyresponsibilitytoactivelymakeu

23、seofinternalaudittoolsdetectpotentialmanagementstreamlinestardizerelatedtransactionsstrengtheningoperationsinaccdancewithlaw.Deepeningtheinfmationmanagementtoensurefullcommunication“zeroresistance“.ToconstantlyperfectERP

24、BFSPIMISSCMinfmationsystembasedconstructionfullintegrationinfmationsystemachievedinfmationresourcessharedtoexpPtalsystemapplicationofbreadthdepthplayinfmationsystemonenterpriseofAssistantroletoperfectdailyrunmaintenanceo

25、perationofrecdspromoteproblemreasonsanalysissystemhovertostrengtheningBFSERPSCMtechnologyapplicationoftrainingimproveemployeesapplicationinfmationsystemofcapacitylevel.Humanisticcaretoensure“zero.“TostrengtheningHumaniti

26、escarecontinuestofostercompanywindcleargasareheartShunofcultureatmospherestrengtheninglovehelpedtrappedcaredifficultemployeescarriedoutstyleactivitiesrichemployeeslifestrengtheninghealthlabourprotectionganizationcareerhe

27、althmedicalcontrolcareeragainstcontinuestoimplementationpsychologicalwarningpreventionsystemtrainingemployeeshealthofacterstableofmoodenterprisingofattitudecreatedfriendlyfraternityofHumanitiesenvironment.Tostrengthenris

28、kmanagementensurethatthebusinessof“zerorisk“.Tostrengthenedbusinessplansmanagementwillbusinessbusinessplanscovertoalllevelensurethebusinesscancontrolincontroltocloseconcernfinancialcoalelectriclinkageenergysavingscheduli

29、ngnationalpolicytrendsstrengtheningtrackactiveshouldtoimplementationStateownedassetsmethodfurtherspecificationbusinessfinancialmanagementtoperfectrisktubecontrolsystemachievedriskrecognitionmeasureassessmentreptcontrolfe

30、edbackofclosedringmanagementimproveriskpreventioncapacity.Tofurtherstardizetradingstrivetoachieve“accdingtolawstardizefair.“Innovationofperfmancemanagementtoensurethatpotentialemployees“zerofly“.Tostrengthenperfmancemana

31、gementprocesscontrolenhanceemployeeevaluationlevelsofeffectivecommunicationtoimproveperfmancemanagement.Tofurtherquantifyrefineemployeestards...Wkfullplaypartybranchmembersin“fivetypeEnterprise“constructionintheofcerolef

32、ightingftressrolepioneermodelroletocontinuestostrengthening“fourgood“l(fā)eadershipconstructionfullplaylevelscadresinenterprisedevelopmentintheofbackbonebackboneroletofullstrengtheningmembersyouthwkfullplayyouthemployeesinco

33、mpanydevelopmentintheoffceroletoimproveindependentCommissionagainstcruptionwklevelstrengtheningonenterprisebusinesskeylinkofeffectivenessmonited.maintainstability.Tofurtherstrengthenpublicityeducationimprovetheoverallleg

34、alsystem.Wemuststrengthensafetymanagementestablishimprovetheeducationsupervisionevaluationasoneofthetrafficsafetymanagementmechanism.ToconscientiouslysumuptheOlympicsecuritycontrolspromotingintegratedmanagementtoahigherl

35、evelhigherstardsahigherlevelofdevelopment.EmployeestodayislunarcalendaronDecember24theoxBellisabouttoringatthistimeofyearweclearlyfeelthepulseoftheXXpowergenerationcompanytoflourishtomeclearlyhearXXpowergenerationcompani

36、esmaturesymmetrybreathing.Recallingpastoneanotheracrossarailingweareenthusiasticfullofconfidence.Futuredevelopmentopptunitieswemeexcitingfightmespirited.Employeesletustogetheracross2013fullofchallengesopptunitiestocreate

37、agreenlowcostoperationfullofhumanecareofawldclasspowergenerationcompanywkhard!TheoccasionoftheSpringFestivalmysincerewishthatyouthefamiliesofthestaffinthenewyeargoodhealthhappyhappy310、直流電機的額定功率PN對發(fā)電機來講是指輸出的電功率，對電動機來講是指輸

38、入的電功率。（）11、直流電機中裝設換向極的目的主要是為了削弱主磁場。（）12、直流電動機電樞串電阻調速，能使空載轉速提高，機械特性變軟。（）13、直流電動機的人為特性都比固有特性軟。（）14、提升位能負載時的工作點在第一象限內，而下放位能負載時的工作點在第四象限內。（）15、他勵直流電動機降壓或串電阻調速時，最大靜差率數(shù)值越大，調速范圍也越大。（）16、直流電動機在能耗制動過程中電動勢Ea與電樞電流Ia同方向。（）17、直流電動機的電

39、磁轉矩與生產(chǎn)機械的負載轉矩同向。（）18、并勵電動機的制動常采用反向制動方式。（）19、他勵直流電動機的降壓調速通常是在額定轉速下調整。（）20、在一定條件下，勵磁電流越小，直流電動機的轉速越高。（）21、直流并勵電動機的勵磁繞組不允許開路是因為開路了沒有磁場，電機轉不起來。（）22、他勵直流電動機起動時，應先合電樞電源開關再合勵磁繞組電源開關（）。23、若不串電阻而對他勵直流電動機采取反接制動，則制動時的電流與其起動時電流一樣大。（）

40、24、對于直流電動機，起動時其起動電流越小越好。（）三、選擇題：三、選擇題：1、直流電機電樞中產(chǎn)生的電動勢是（）（a）直流電動勢(b)交變電動勢(c)脈沖電動勢(d)非正弦交變電動勢2、熱繼電器在電路中可起到（）保護作用。(a)短路(b)過流過熱(c)過壓(d)失壓3、直流電機換向極的作用是（）。(a)削弱主磁場(b)增強主磁場(c)抵消電樞反應(d)產(chǎn)生主磁場4、他勵直流電動機的人為特性與固有特性相比，其理想空載轉速和斜率均發(fā)生了變化

41、，那么這條人為特性一定是：（）。（1）串電阻的人為特性；（2）降壓的人為特性；（3）弱磁的人為特性。5、直流電動機采用降低電源電壓的方法起動，其目的是：（）。（1）為了使起動過程平穩(wěn)；（2）為了減小起動電流；（3）為了減小起動轉矩。6、自動往返控制線路屬于（）線路。(a)正反轉控制(b)點動控制(c)自鎖控制(d)順序控制7、直流電動機反接制動時，當電機轉速接近于零時就應立即切斷電源，防止（）。(a)電動機反轉(b)電流增大(c)發(fā)生短