北京2017年电机装配工：维修电工模拟试题VIP免费

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．8B．10C．15D．206、Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybecauseoftheextremedifficultyinaffixing(把……固定)legalresponsibilityonthosewhocontinuetotreatourenvironmentwithrecklessabandon(放任).Attemptstopreventpollutionbylegislation,economicincentivesandfriendlypersuasionhavebeenmetbylawsuits,personalandindustrialdenialandlongdelays---notonlyinacceptingresponsibility,butmoreimportantly,indoingsomethingaboutit.Itseemsthatonlywhengovernmentdecidesitcanaffordtaxincentivesorproductionsacrificesisthereanyinitiativeforchange.Whereisindustry’sandourrecognitionthatprotectingmankind’sgreattreasureisthesinglemostimportantresponsibilityIfevertherewillbetimeforenvironmentalhealthprofessionalstocometothefrontlinesandprovideleadershiptosolveenvironmentalproblems,thattimeisnow.Wearebeingasked,and,infact,thepublicisdemandingthatwetakepositiveaction.Itisourresponsibilityasprofessionalsinenvironmentalhealthtomakethedifference.Yes,theecologists,theenvironmentalactivistsandtheconservationistsservetocommunicate,stimulatethinkingandpromotebehavioralchange.However,itisthoseofuswhoarepaidtomakethedecisionstodevelop,improveandenforceenvironmentalstandards,Isubmit,whomustleadthecharge.Wemustrecognizethatenvironmentalhealthissuesdonotstopatcitylimits,countylines,stateorevenfederalboundaries.Wecannolongeraffordtobetunnel-visionedinourapproach.Wemustvisualizeissuesfromeveryperspectivetomaketheobjectivedecisions.Wemustexpressourviewsclearlytopreventmediadistortionandpublicconfusion.Ibelievewehaveathree-partmissionforthepresent.First,wemustcontinuetopressforimprovementsinthequalityoflifethatpeoplecanmakeforthemselves.Second,wemustinvestigateandunderstandthelinkbetweenenvironmentandhealth.Third,wemustbeabletocommunicatetechnicalinformationinaformthatcitizenscanunderstand.Ifwecanaccomplishthesethreegoalsinthisdecade,maybewecanfinallystopenvironmentaldegradation,andnotmerelyholditback.Wewillthenbeabletospendpollutiondollarstrulyonpreventionratherthanonbandages.Whichofthefollowing,accordingtotheauthor,shouldplaytheleadingroleinthesolutionofenvironmentalproblems()A．Legislationandgovernmentintervention.B．Theindustry'sunderstandingandsupport.C．Theeffortsofenvironmentalhealthprofessionals.D．Thecooperationofecologists,environmentalactivistsandconservationists.7、笼型转子焊接时，不同的笼条采用不同的焊料。纯铜笼条一般采用__钎料。A．铅B．银C．铜磷D．锡8、湿热带型电机可装有__。A．散热器B．风扇C．防潮加热器D．漏电保护器9、三相异步电动机外壳带电原因...