Eddy Current- Q&A-01

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1、ElectromagneticTesting-ECTQ&A2014-DecemberMyASNTLevelIIIPre-ExamPreparatorySelfStudyNotesCharlieChong/FionZhangCharlieChong/FionZhangCharlieChong/FionZhanghttp://www.mdpi.com/1424-8220/11/3/2525/htmCharlieChong/FionZhangCharlieChong/FionZhangCharlieChong/FionZhang激发我更加的努力学习.C

2、harlieChong/FionZhangCharlieChong/FionZhangCharlieChong/FionZhang艰难激发我更加的努力学习:您我在面对同业考核时算贫乏吗?CharlieChong/FionZhanghttp://tieba.baidu.com/p/371574522瑰丽激发我更加的自信:然而您我在面对同业考核时算贫乏吗徐汇中学?CharlieChong/FionZhangCharlieChong/FionZhangFionZhangatNanjing2014/DecemberShanghai上海CharlieCho

3、ng/FionZhanghttp://meilishouxihu.blog.163.com/GreekletterCharlieChong/FionZhangNRCan-LevelIExamination:CharlieChong/FionZhangLevel1GeneralExamination:Q1.Choosetheincorrectstatement.a)EddycurrenttestingwasdiscoveredbyF.L.Eddie.b)Faradaydiscoveredelectromagneticinduction.c)Elec

4、tromagneticinductionisthebasisoftheeddycurrentmethod.d)Eddycurrenttestingcannotbeusedtoinspectnon-conductors.Q2.Asymbolcommonlyusedtoexpressconductivityis:a)μ.(mu)b)σ.(sigma)c)X.Ld)R.Q3.Asymbolcommonlyusedtoexpresspermeabilityis:a)μ.b)σ.c)X.Ld)R.CharlieChong/FionZhangQ4.Aterm

5、usedtodefineamaterialhavingarelativemagneticpermeabilitylargerthan1is:a)ferromagnetic.b)conductor.c)semiconductor.d)insulator.Q5.Thesymbolcommonlyusedtosignifyinductanceis:a)Z.b)X.Lc)L.d)I.CharlieChong/FionZhangImpedanceZisthevectorsumofresistanceR,inductancereactanceXandLcap

6、acitancereactanceXCSymbols:IAmpere(A)Current.ROhm(Ω)Resistance.VVolt(V)Voltage.ZOhm(Ω)Impedance.XOhm(Ω)InductanceReactance.LXOhm(Ω)CapacitiveReactance.CρΩ.mResistivity.σSiemens/mConductivity.LHenry(H)Inductance.Cfarad(F)Capacitance.μHenries/mMagneticPermeability.BTesla(N·m-1·

7、A-1)MagneticFluxDensity.HAmpere/m(A.m-1)MagneticForce.CharlieChong/FionZhangQ6.Thealternatingcurrentrequiredbytheeddycurrenttestissuppliedbythe:a)transformerb)phaserotatorc)ACtoDCconverterd)sinewaveoscillatorQ7.Allmaterialshaveacharacteristicresistancetotheflowofelectricity.T

8、hosehavingalowresistanceareclassifiedas:a)insulators.b)semiconductor