接触网工技能鉴定复习题---中级工部分

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1、接触网工技能鉴定复习题---中级工部分ThesecondpartistheintermediateworkerFirst,intermediatecontactnetworkknowledgerequiressomeexercises(1)fillintheblanks(fillintheblanksintheblanks)Example1anyactivetwoterminalnetworkcanbereplacedbyone.Equivalentpowersupply.Thedevicefordeterminingcontactline2isca

2、lledapositioningdevice.Answer:flatposition.Example3thepressureonthesoilperunitareaiscalled.Answer:soilpressure.Example4rodinsulatorsareusedtowithstandthesuspensionparts.Answer:pressureandbendingmoment.Example50thousandmeasuringrodwithmeter"+"pole:Answer:red.ExercisesThethreeele

3、mentsofthe1.forceontheobjectandtheeffectdependingon,changeanyofthesefactors,theeffectofforceontheobjectis.The2.forceisavector,andthethreeelementofforcecanbeusedtoexpressit.Thedirectionofthereactionforceofthe3.flexiblebodyisalongtherope,whiletheobjectistheobject.4.theconstraintf

4、orceofafixedendistwocomponents,thatis,oneforceandoneforce.5.whenaprojectionpointandthecoordinateaxisisconsistent,theprojectionvalues.Theprojectionofthe6.resultantforceonthecoordinateaxisequaltotheprojectionofeachcomponentontheaxis.The7.momentisequaltozerointhefollowingtwocases:

5、(1)forceequalszero;(2)thelineofactionofforcepasses.The8.forcecausesthebodytorotateinananticlockwisedirectionaroundthecenterofthemoment.Consistingof9.equalandopposite,linetwo______forceiscalledthecouple.Thethreeelementsof10.couples:(1)thetorqueofthesize;(2)thecouple;(3)theeffect

6、oftherange.The11.couplecouldnotformaforce,sothecouplewithaforcetobalance.12.themaximumstaticfrictionforceFmaxisthenormalreactionforce(positivepressure)Nonthecontactsurface.13.thecoefficientofthestaticfrictioncoefficientfisrelatedtothematerialofthetwocontactobject.Thedeformation

7、characteristicsof14.axialcompressionarethatthememberisintheaxialdirection.15.axialtension(orcompression),thecrosssectionofthebaronthedirectionofthenormalstressandthesurface.16.forthecircuitwithnodenumberNandbranchnumberB,thecurrentequationofindependentnodeshouldbegivenwhenbranc

8、hcurrentmethodisused.Theforceproducedby17.parallelwire