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北京2017年电机装配工:维修电工模拟试题VIP免费

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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...

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北京2017年电机装配工:维修电工模拟试题

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