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1、北京2017年电机装配工：维修电工模拟试题本卷共分为2大题50小题，作答时间为180分钟，总分100分，60分及格。一、单项选择题（共25题，每题2分，每题的备选项中，只有1个事最符合题意）1、电流平衡法是指对功率较大的三角形联结的电动机，先将定子绕组的一个接点拆开，再逐相通入低电压大电流的交流电，测量其电流，其中__的一相即为断路相。
A．电流小
B．电流大
C．电流恒定
D．较大2、三相异步电动机定子重绕选择绕组形式时，功率大于15kW的三相电动机，一般采用__绕组。
A．单层短节距
B．单层长节距
C．单层短节距
D．双层短节距3、制定装配工艺规程的
2、第一步是__。
A．研究产品装配图及验收技术标准
B．确定部件或产品的装配方法
C．划分装配单元及规定最合理的装配顺序
D．划分装配工序4、直流电动机换向器火花过大时，应__。
A．更换电刷
B．调节电刷的机械位置
C．增大电刷与换向器的接触电阻
D．改变换向极的极性5、转子绕组绑扎钢丝时，每绑扎__匝用石棉纸隔开，以减少涡流损耗。
A．8
B．10
C．15
D．206、Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybeca
3、useoftheextremedifficultyinaffixing(把……固定)legalresponsibilityonthosewhocontinuetotreatourenvironmentwithrecklessabandon(放任).Attemptstopreventpollutionbylegislation,economicincentivesandfriendlypersuasionhavebeenmetbylawsuits,personalandindustrialdenialandlongdelays--
4、-notonlyinacceptingresponsibility,butmoreimportantly,indoingsomethingaboutit.Itseemsthatonlywhengovernmentdecidesitcanaffordtaxincentivesorproductionsacrificesisthereanyinitiativeforchange.Whereisindustry’sandourrecognitionthatprotectingmankind’sgreattreasureisthesingl
5、emostimportantresponsibilityIfevertherewillbetimeforenvironmentalhealthprofessionalstocometothefrontlinesandprovideleadershiptosolveenvironmentalproblems,thattimeisnow.Wearebeingasked,and,infact,thepublicisdemandingthatwetakepositiveaction.Itisourresponsibilityasprofessionalsinenv
6、ironmentalhealthtomakethedifference.Yes,theecologists,theenvironmentalactivistsandtheconservationistsservetocommunicate,stimulatethinkingandpromotebehavioralchange.However,itisthoseofuswhoarepaidtomakethedecisionstodevelop,improveandenforceenvironmentalstandards,Isubmit,whomustlea
7、dthecharge.Wemustrecognizethatenvironmentalhealthissuesdonotstopatcitylimits,countylines,stateorevenfederalboundaries.Wecannolongeraffordtobetunnel-visionedinourapproach.Wemustvisualizeissuesfromeveryperspectivetomaketheobjectivedecisions.Wemustexpressourviewsclearlytopreventmedia
8、distortionandpublicconfusion.Ibel
