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磁粉II级基础理论试卷MTLevelIIGeneralExamination姓名：答卷时间：地点：NameTimeLocation得分：评卷人：时间：MarksExaminerDate1.每平方厘米一根磁感应线的度量单位为：(C)A)一奥斯特B)一欧姆C)一高斯D)一安培Theunitofmeasureofonelineoffluxpersquarecentimeterofareaisone:A)OerstedB)OhmC)GaussD)Ampere2.围绕零件的线圈产生：(B)A)周向磁场B)纵向磁场C)依电流类型可能为A，也可能为BD)间隙磁场Acoilaroundthepartproduces:A)acircularfieldB)alongitudinalfieldC)eitherAandBdependingonthetypeofcurrentappliedD)anintermittentfield3.能被强烈地吸引到磁铁上的材料叫做：(C)A)被磁化的材料B)非磁性材料C)铁磁性材料D)被极化的材料Materialswhicharestronglyattractedtoamagnetarecalled:A)magnetizedB)nonmagneticC)ferromagneticD)polarized4.受磁场吸引微弱的材料叫做：(A)A)顺磁性材料B)抗磁性材料C)铁磁性材料D)非磁性材料Materialswhichareweaklyattractedmagneticallyarecalled.A)paramagneticB)diamagneticC)ferromagneticD)nonmagnetic5.被磁场排斥的材料叫做：(B)A)顺磁性材料B)抗磁性材料C)铁磁性材料D)非磁性材料Materialswhicharerepelledmagneticallyarecalled.A)paramagneticB)diamagneticC)ferromagneticD)nonmagnetic6.磁铁上，磁力线进入的一端叫做：(B)A)北极B)南极C)北极和南极D)以上都不是Theendofamagnetatwhichthelinesoffluxareenteringis:A)thenorthpoleB)thesouthpoleC)bothnorthandsouthpolesD)noneoftheabove7.将铁粉撒在一根磁棒上的纸上，由铁粉形成的图案叫做：(C)A)磁场测量图B)磁强计C)磁图D)磁通计Thepatternofironpowdersprinkledonapaperplacedoverbarmagnetiscalled:A)fieldsurveyB)magnetometerC)magnetographD)fluxmeter8.在环形磁铁上围绕一个裂纹形成的磁力线叫做：(B)A)磁力线B)漏磁通C)磁场强度D)纵向磁场Thelinesofforcethatformapatharoundacrackinaringmagnetarecalled:A)magneticlineofforceB)leakagefluxC)fieldstrengthD)longitudinalfield9.棒形磁铁内的磁力线沿磁铁的长度方向，这个磁棒的磁化叫做？(D)A)随机磁化B)永久磁化C)周向磁化D)纵向磁化Sincethemagneticlinesofforcewithinabarmagnetrunthelengthofthebar,itissaidtobe:A)randomlymagnetizedB)permanentlymagnetizedC)circularlymagnetizedD)longitudinallymagnetized10.下列哪种方法可使试样退磁？(D)A)高于居里温度的热处理B)交流线圈C)可反向的直流磁场D)以上方法均可以Aspecimenmaybedemagnetizedbywhichofthefollowingmethods?A)heattreatmentabovecurietemperatureB)ACcoilC)reversingDCfieldsD)alloftheabove11.零件中磁性均匀性的间断与什么参数的急剧变化有关？(D)A)电感B)电阻率C)电容D)磁导率Abreakinthemagneticuniformityofapartthatiscalledamagneticdiscontinuityisrelatedtoasuddenchangein?A)inductanceB)resistivityC)capacitanceD)permeability12.直径为1英寸和2英寸的棒材通过相同的电流进行磁化，其表面磁场：(D)A)两根棒的磁场相同B)直径为2英寸的棒材磁场较强C)直径为1英寸的棒材磁场较弱D)直径为1英寸的棒材磁场较强Ifone-inchandtwo-inchdiameterbarsweremagnetizedbypassingthesamecurrentthroughthem,themagneticfieldswouldbe:A)thesameforbothB)strongerinthetwo-inchdiameterbarC)weakerintheone-inchdiameterbarD)strongerintheone-inchdiameterbar13.同样大小的电流通过两根尺寸相同的导体时，如果一根是磁性的，另一根是非磁性的，则围绕导体的磁场：(D)A)磁性导体周围的磁场较强B)非磁性导体周围的磁场较强C)随磁导率变化D)两根导体一样Ifacurrentofthesameamperageispassedthroughtwoconductorswiththesamedimensionsoneofwhichismagneticandoneofwhichisnonmagnetic,themagneticfieldsurroundingtheconductorswill:A)bestringerforthemagneticconductorB)bestrongerforthenomagneticconductorC)varywiththepermeabilityD)bethesameforbothconductors14.下面哪种铸造的缺陷是由于冷却不均匀产生的应力使金属表面断裂而引起的？(B)A)缩松B)热裂C)气孔D)夹渣Whichofthefollowingcastingdefectsiscausedbynon-uniformcoolingresultinginstresseswhichrupturethesurfaceofthemetal?A)shrinkB)hottearsC)porosityD)dross15.表示电路中电阻、电压和电容的综合效应对电流总阻力的术语是：(B)A)感抗B)阻抗C)磁阻D)衰减Thetermusedtorefertothetotaloppositiontoflowofcurrentrepresentedbythecombinedeffectofresistance,inductance,andcapacitanceofacircuitis:A)inductivereactanceB)impedanceC)reluctanceD)decay16.对一个未经加工的坯件进行磁粉检验时，发现一个向各个方向延伸的显示。显示看起来垂直于表面，延伸至零件深处，显示非常清晰，该显示可能是哪种缺陷？(A)A)锻裂B)折叠C)白点D)缝隙Aroughforgingthathasreceivednofurtherprocessingismagneticparticletested.Anindicationisobservedtorunineverydirection.Itappearstoextenddeeplyintothepartandperpendiculartothesurface.Itisverysharp.Whatistheprobableidentityoftheindication?A)forgingburstB)lapC)flakeD)seam17.半波整流交流电用来检测：(C)A)表面缺陷B)近表面缺陷C)表面和近表面缺陷D)以上都不是HalfwaverectifiedAC(HWDC)isusedfordetectionof:A)surfacedefectsonlyB)subsurfacedefectsonlyC)surfaceandsubsurfacedefectsD)noneoftheabove18.下面哪种缺陷不是滚轧产品中常见的缺陷：(C)A)缝隙B)分层C)冷隔D)裂纹Whichoneofthefollowingisnotadiscontinuitycommontorolledproducts?A)SeamsB)LaminationsC)ColdshutsD)Cracks19.下面哪种缺陷不是锻造产品中常见的缺陷？(B)A)折叠B)缩孔C)裂纹D)白点WhichoneofthefollowingisnotadiscontinuitycommontoforgedproductsA)lapsB)shrinkageC)burstsD)flakes20.下列缺陷中，哪种缺陷被认为是对零件使用寿命最有害的？(C)A)近表面夹杂B)近表面气孔和孔穴C)露出表面的裂纹D)以上都是Ofthefollowingdiscontinuitycategories,whichoneisconsideredmostdetrimentaltotheservicelifeofanitem?A)subsurfaceinclusionsB)subsurfaceporosityandvoidsC)cracksopentothesurfaceD)alloftheabove21.电流从正到负流过线圈时，建立一个纵向磁场，下面哪种法则可用来确定磁场的方向？(B)A)左手定则B)右手定则C)欧姆定律D)没有相关的定律Withcurrentflowingfrom+to-inacoil,alongitudinalfieldiscreated.Whichofthefollowingmaybeusedtoestablishthedirectionofthemagneticfield?A)lefthandruleB)righthandruleC)ohmslawD)thereisnorelevantlaw22.电流通过导体时，围绕导体的是：(C)A)涡流场B)电流C)磁场D)剩磁场Ifacurrentispassedthroughanelectricalconductor,whatwillsurroundtheconductor?A)eddycurrentfieldB)currentC)magneticfieldD)residualfield23.从零件一端到另一端通电磁化零件时，零件的长度：(C)A)影响零件的磁导率B)改变磁场的强度C)对磁场强度无影响D)使磁场发生变化Thelengthofapartbeingmagnetizedbypassinganelectriccurrentfromoneendtotheother:A)affectsthepermeabilityofthepartB)changesthestrengthofthemagneticfieldC)doesnotaffectthestrengthofthemagneticfieldD)causesthemagneticfieldtovary24.用来表示被检零件金属的连续性间断的通用术语是：(A)A)不连续性B)裂纹C)缝隙D)折叠Thegeneraltermusedtoabreaki