UT-Ⅲ级方法考试试卷

--#-UT-III级方法考试试卷UTmethodquestionsforlevelIII拟题级别审批阅卷PreparedbyLevelUTApprovedbyCorrectedby姓名成绩NameMark（fullpointis1.5%perquestion）Acouplantisneededforatestonahotsteelplate（250°F）.Whichofthefollowingmaterialscanbeused?下列那种材料可用作热钢板（120°C）检验的耦合剂？（）Water水Mercury水银tractoroil机油noneoftheabove以上都不行。Acouplantisneededforatestonstainlesssteelwelds.NumerousCouplantareavailable.Whichshouldbechosen?检验不锈钢焊缝，在下列提供的几种耦合剂中，应选择哪一种？（）acouplantfreeofchlorine无氯的耦合剂glycerine甘油oil油water水。A5MHz,0.5in.diameter,flatsearchunitinwaterhasanearfieldlengthofapproximately.5MHz,直径0.5吋的直探头，在水中的近场长度大约多长？（）7in.（英寸）2in.（英寸）3-1/3in.（英寸）5-1/2in.（英寸）Aconcavelensonatransducerwillresultinthenearfieldinwaterbeing换能器前的凹透镜会使声场在水中的近场长度变成（）。twiceaslongaswithaflatlens.平透镜的两倍。threetimesaslongaswithaflatlens.平透镜的三倍。thesamelengthaswithaflatlens.与平透镜一样。shorterthanwithaflatlens.短于平透镜近场长度。A10MHz,0.5in.dia.,searchunitisplacedonsteelandacrylicplasticinsuccession.Thebeamspreadinthesetwomaterialsisapproximately10MHz,直径0.5吋的直探头放在钢板上，钢板后紧贴有丙烯树脂塑料。声束在两种材料中的扩散角约为（）。3and1.5degrees,respectively.分别为3°，1.5°。1.5and3degrees,respectively.分别为1.5°，3°。equalinthetwomaterials.在两种材料中相同。lessthanthebeamspreadof15MHzsearchunitofthesamediameter.比15MHz同直径探头扩散角小。Inanimmersiontestofcommerciallypuretitaniumplate（Cl=6100m/s）,anechopulsefromaninternaldefectisobserved6.56卩secfollowingthefrontsurfaceecho.Howdeepisthereflectorbelowthefrontsurface?钛板（C=6100m/s）水浸探伤中，在第一次表面回波后6.56“观测到一个內部缺陷波，求反射体在表面下多深？（）TOC\o"1-5"\h\z2cm4cm1cm2in.Whatlensradiusofcurvatureisneededinordertohavea2cmdia.,5MHztransducerfocusinwateratadistanceof4cmfromthelensface?（CH2O=1490m/s,Clens=2670m/s）5MHz,直径2cm换能器装有平凹透镜，欲使水中焦距为4cm，透镜曲率半径为多大？（C水=1490m/s，C镜=2670m/s）A.1.77cmB.3.50cmC.3.17in.D.2.23in.Twosignalswerecomparedinamplitudetoeachother.Thesecondwasfoundtobe14dBlessthanthefirst.Thischangecouldhaverepresentedachangeof对两个信号的幅度进行对比，发现第二个信号比第一个信号小14dB，这种差异表示波幅的变化是（）。70%FSHto14%FSH满屏高70%到14%100%FSHto50%FSH满屏高100%到50%100%FSHto20%FSH满屏高100%到20%100%FSHto25%FSH满屏高100%到25%Platethickness=25.4mm,pulse-echo,straightbeammeasuredelapsedtime=8ps.Whatisthemostlikelymaterial?板厚为25.4mm,直探头测得的脉冲回波时间为8“s，则板的材料最可能为（）。carbonsteel碳钢lead铅titanium钛aluminum铝Thetransmittedpulseattheoutputofthepulserusuallyhasavoltageof100to1000V,whereasthevoltageoftheechoattheinputoftheamplifierareontheorderof脉冲发生器输出端的发射脉冲电压通常为100〜000伏，而放大器输入端的回波电压大约只有（）。10volts.10伏50volts.50伏0.001to1volts.0.001〜1伏1to5volts.1〜5伏Whichofthefollowingmightresultinincreasedtransmissionofultrasoundwithinacoarse-grainedmaterial?下列哪种方法可增大超声波在粗晶材料的穿透力？（）Performtheexaminationwithasmallerdiametertransducer用直径较小的探头进行检验；Performtheexaminationafteragrainrefiningtreatment在晶粒细化热处理后进行检验；Changefromacontactexaminationtoanimmersionexamination将接触法检验改为液浸检验；Changefromalongitudinaltoatransversewave将纵波检验改为横波检验。Whenmaterialgrainsizeisontheorderof（）wavelengthoflarger,excessivescatteringoftheultrasonicbeammayaffecttestresult.材料晶粒尺寸约大于多少波长时，超声波的散射会影响试验结果？11/21/101/100Thesensitivityofanultrasonictestsystem超声波试验系统的灵敏度（）。dependsonthesearchunit,pulser,andamplifierused.取决于探头、脉冲发生器和放大器decreasesasthefrequencyisincreased.随频率提高而降低increasesastheresolutionincreases.随分辨力提高而提高isnotrelatedtomechanicaldampingofthetransducer.与换能器的机械阻尼无关系Searchunitsensitivityismostoftendeterminedby确定探头灵敏度最常用的方法是（）。calculationsbasedonfrequencyandthicknessofpiezoelectricelement依据频率和压电晶片的厚度进行计算theamplitudeoftheresponsefromanartificialdiscontinuity用来自人工缺陷的回波信号振幅确定comparingittoasimilarsearchunitmadebythesamemanufacture与同一厂家制造的同种探头进行比较determiningtheringingtimeofsearchunit确定探头的振荡时间NotchesprovidegoodreferencediscontinuitywhenUTexaminationisconductedtoprimarilydetectdefectssuchas探测哪种缺陷时可用缺口作为一种良好的参考缺陷？（）porosityinrolledplate.滚轧板材的疏松inadequatepenetrationattherootofaweld.焊缝根部的未焊透weldporosity.焊缝中的气孔internalinclusion.内部夹杂Thedifferencebetweenacompressionandshearwaveis压缩波和切变波之间的区别是（）。quantitativemeasure.定量测量particledirection.质点振动方向qualititativemeasure.定性测量amplitude.振幅TheparticlemotionforRayleighwavesisusuallydescribedas瑞利波的质点振动是（）。sinusoidal.正弦的circular.圆形的elliptical.椭圆形的shear.剪切形的Baseduponwavetheoryandignoringattenuationlosses,theechoamplitudeis按照波动理论，在忽略衰减损耗的情况下，回波振幅（）。directlyproportionaltothedistancetothereflector.与反射体的距离成正比inverselyproportionaltothedistancetothereflector.与反射体的距离成反比directlyproportionaltothesquareofthedistancetothereflector.与反射体的距离的平方成正比inverselyproportionaltothesquareofthedistancefromthereflector.与反射体的距离的平方成反比InA-scanequipment,theRFpulseroutputvoltageisnormallyintherangeof在A扫描设备中，射频脉冲发生器的输出电压一般在什么范围内？（）1-10volts.1〜10伏10-100volts.10〜100伏100-1000volts.100〜1000伏1000-3000volts.1000〜3000伏Asyouincreasethefrequencyofagivensizetransducer,换能器尺寸不变而频率提高时，（）。thelateralresolutionisimpaired.横向分辨力降低thebeamdivergenceincreases.声束扩散角增大thelengthofthenearfieldincreases.近场长度增大thesensitivityincreases.灵敏度提高Whichfrequencycanbestdistinguishthedifferencebetweenalargeplanardefectand4stackedlaminationsinrolledplate?下列哪种频率的声波对于区分轧制板材中大平面缺陷和叠层分层缺陷最好？（）A.0.5MHzB.1MHzC.2.25MHzD.5MHzThepulseappliedtotheelectrodesoftheultrasonicsearchunitis施加于超声波探头电极上的脉冲是（）。electrical.电信号mechanica.机械信号electro-mechanical.电机械信号piezoeletrical.压电信号Testsensitivitycorrectionsformetaldistanceanddiscontinuityarearesponsesareaccomplishedbyusing对于金属距离和缺陷面积响应进行灵敏度修正时，应使用（）。anarea/amplitudesetofblocks.面积/振幅试块anarea/amplitudeanddistance/amplitudesetofblocks.面积/振幅和距离/振幅试块adistance/amplitudesetofblocks.距离/振幅试块steelballsofvaryingdiameter.各种直径的钢球Thetimefromthestartoftheultrasonicpulseuntilthereverberationscompletelydecaylimitsthemaximumusable从超声脉冲开始发生到振动完全衰减的时间限制了最大可使用的（）。pulsetime-flawrate.脉冲时间－缺陷速率pulser/receiverrate.脉冲发生/接收速率pulserepetitionrate.脉冲重复频率modifiedpulse-timerate.变更的脉冲－时间速率Theresonantfrequencyofa2cmthickplateofNavalbrass（C=4430m/s）is2cm厚的Naval黄铜板（C=4430m/s）的共振频率为（）。0.903MHz.0.443MHz.0.222MHz.0.111MHz.Whichofthefollowingtransducermaterialsmakesthebesttransmitter?下列哪种换能器材料作为声发射器最好？（）Quartz石英Lithiumsulfate硫酸锂Bariumtitanate钛酸钡Noneoftheabove.以上都不好Ofthetransducermaterialslistedbelow,themostefficientreceiveris下列哪种换能器材料是最有效的声接收器？（）Quartz.石英lithiumsulfate.硫酸锂bariumtitanate.钛酸钡leadmeta-niobate.偏铌酸锂Atypicalapplicationofshearwavesinultrasonictestingisinspectionof超声波探伤时，切变波的典型应用是检验（）。welds.焊缝plate.板材pipeandtubing.管材alloftheabove.以上都是Inanglebeamshearwavetesting,skipdistancewill（）asthethicknessofthetestspecimenisincreased切变波斜角探伤中，当试样厚度增加时，跨距将（）。decrease减小notchange不变increase增加decreasebyhalfwithdoublethickness厚度加倍，跨距减半ThethicknessrangeofUTresonancethicknessgagescanbeincreasedby超声波共振测厚仪的测厚范围可以用哪种方法扩大？（）usinglargetransducer.使用大尺寸换能器operatingatthefundamentalfrequency.在基频上工作operatingataharmonicfrequency.在谐频上工作increasethevoltage.提高电压Theabilityoftransducertodetectechoesfromsmalldefectsisadefinitionfor换能器检出小缺陷回波的能力定义为（）。resolution.分辨力sensitivity.灵敏度definition.清晰度gain.增益Fromtheequationforthelengthofthenearfield,itcanbedeterminedthatthenearfieldcanbeminimizesby按照近场长度公式，可以通过哪种方式减少近场长度？（）decreasingwatertraveldistance.减少水距increasingtransducerdiameter.增大换能器直径decreasingthesizeofreferencetargets.减小反射靶尺寸decreasingtestfrequency.降低试验频率Inawater（C=1500m/s）immersiontest,ultrasonicenergyistransmittedintosteel（Cs=3200m/s）atanincidentangleof14°.Whatistherefractedshearwavewithinthematerial?钢板水浸探伤时，超声波以14°入射角发射到工件中，已知C水=1500m/s,C钢=3200m/s,求钢中的切变波折射角。（）TOC\o"1-5"\h\z13°35°31°53°Theacousticimpedanceforbrass（C=4430m/s,p=8.42X103kg/m3）is黄铜（C=4430m/s,p=8.42X103kg/m3）的声阻抗为（）。5.3X105kg/m2-s9.4X105kg/m2-s1.9X105kg/m2-s36X105kg/m2-sTheprincipalattributesthatdeterminethedifferencesinultrasonicvelocitiesamongmaterialsare造成不同材料中超声波速度差别的主要因素是（）。frequencyandwavelength.频率和波长thicknessandtraveltime.厚度和传播时间elasticityanddensity.弹性和密度Chemistryandpermeability.化学性质和磁导率Thetermthatisusedtodeterminetherelativetransmittanceandreflectanceofenergyataninterfaceiscalled决定声波在界面上相对透过率和反射率的术语叫做（）。acousticattenuation.声衰减interfacerefraction.界面折射acousticimpedanceratio.声阻抗比acousticfrequency.声频率Ingeneralwhenadiscontinuityisthinitisapoorreflector.Themaximumreflectionisobtainedwhenthethicknessofthediscontinuityisequaltoatleast一般来说，缺陷愈薄，对声波的反射愈差。当缺陷厚度至少为多大时能得到最大反射？（）onequarterwavelength.1/4波长one-halfwavelength.1/2波长onewavelength.一个波长evenmultiplesofone-halfwavelength.1/2波长的偶数倍Surfacewavesarereducedtoanenergylevelofapproximately1/25oftheoriginalpoweratadepthof表面波能量在多大深度上会降低到原能量的大约1/25？（）oneinch.一英寸fourinch.四英寸onewavelength.一个波长fourwavelengths.四个波长Increasingthelengthofthepulseusedtoactivatethesearchunitwill当激励探头的脉冲长度增加时（）。increasethestrengthoftheultrasoundbutdecreasetheresolvingpoweroftheinstrument.超声波强度增大，但仪器分辨力降低increasetheresolvingpoweroftheinstrument.仪器分辨力提高havenoeffectonthetest.对试验无影响decreasethepenetrationpowerofthesoundwave.声波穿透力降低Anglebeamtestingofplatewilloftenmiss钢板超声斜角探伤时，常会漏掉（）。crackthatareperpendiculartothesoundwave.与声波垂直的裂纹inclusionsthatarerandomlyoriented.方向无规律的夹杂laminationsthatareparalleltothefrontsurface.与表面平行的分层aseriesofsmalldiscontinuities.串状小缺陷WhenmeasuringtheangleonananglebeamsearchunitusinganIIWblock,twosignalsarenoted.Thefirstmeasuresatanangleof49degreesandthesecondpeaksatananglethatisestimatedtobe25degrees.Plasticlongitudinalvelocity=2.76mm/ps;steelshearvelocity=3.23mm/ps;longitudinalvelocity=5.85mm/ps.Identifysignals用IIW试块（C2L=5.85mm/pm,C2S=3.23mm/pm）测定斜探头（ClL=2.76mm/pm）声束角度时，发现两个信号，第一个测得角度为49°，第二个波峰对应角度为25°，试识别信号（）。firstisshear,secondislongitudinal.l为横波，2为纵波firstislongitudinal,secondissurface.1为纵波，2为表面波firstislongitudinal,secondisLovewave.1为纵波，2为乐莆波firstislongitudinal,secondisshear.1为纵波，2为横波Asearchunitwithafocallengthinwaterof4in.isused.Asteelplate,8in.thick,velocty=0.23in/microsec.,isplacedatawaterpathof2in.fromthesearchunit.Atwhatdepthisthefocalpointinthesteel?使用水中焦距为4英寸的直探头，水浸法检验8英寸厚钢板（C钢=0.23英寸/“s）,钢板放在水中距探头2英寸处，焦点在钢中多深？（）A.1.0in.1.0英寸B.2.0in.2.0英寸C.0.5in.0.5英寸D.0.8in.0.8英寸Inatandem70degreepitch-catchshearwavearrangement,theplatebeinginspectedis2in.thickandtheregionofinterestismidwaybetweentopandbottomsurfaces.Howfarbehindthetransmittershouldthereceivingtransducerbelocated?两个70°横波探头按串列法布置，检验厚度2英寸板材，检验关注的是上，下表面间中心部位。接收探头应置于发射探头后多远？（）0.68in.0.68.英寸1.88in.1.88英寸4.00in.4.00英寸5.50in.5.50英寸Duringanexamination,anindicationof25%FSHisdetectedandmaximizedontheCRT.Forbetteranalysisthegainisincreasedby12dB,andtheindicationincreasesto88%FSH.Whatvalueshouldhavebeenreachedandwhatistheapparentproblem?检验中，探测到一个最大波幅为满屏咼25%的信号。为便于分析，将增益提咼12dB,信号增加到满屏高的88%，问信号应该增加到多高？出现了什么问题？（）50%FSHandthescreenisnonlinear满屏咼50%，荧屏非线性75%FSHandthereisnoproblem满屏咼75%，不存在问题100%FSHandthesweepspeedisnonlinear满屏咼100%，扫描速度非线性100%FSHandthescreenisnonlinear满屏咼100%，荧屏非线性Thereflectedpulsereachingtheimmersiontransducerfromthebacksurfaceofa4.5in.aluminumplatestandinginatankofwaterisequalto（）oftheenergypulsewhichwastransmittedfromthetransducer.（ZAl=17,ZH2O=1.5）水浸法检验放于水箱中的4.5英寸厚的铝板（ZAl=17,ZH2O=1.5），铝板底面回波反射至探头，其声能为探头发射脉冲能量的百分之多少？（）6.3%70%50%21%Incontacttesting,thebacksurfacesignalfroma2in.platewassetatfullscreenheight.Passingoveracoarsegrainedarea,thebacksurfacesignaldroppedto10percentofthefullscalesignal.Whatwouldbeyourestimateofthechangeinattenuationinthislocalarea?接触法检验2英寸厚的板材，底波信号调整为满屏高，检验中，通过一个粗晶区，底波降低为10%FSH,试估计在这个局部区域衰减的变化多大？（）A.20dB/in.B.10dB/in.C.5dB/inD.10%/in.AsingleVee,buttweldina3in.plateisbeingexaminedusinga60oshearwave.AnindicationontheCRTappearsatasoundpathdistanceof9in..Atthesametimetheexitpointofthetransduceris7.8in..fromthecenterlineoftheweld.Thissuggeststhereflectorcouldbe采用60°横波检验板厚3英寸单V坡口的对接焊缝。荧光屏上显示一声程为9英寸的信号，此时探头入射点至焊缝中心线的距离（探头焊缝距离）为7.8英寸,反射体应估判为（）。acrackinthenearsideHAZ.探头侧热影响区裂纹lackoffusionattheweld/basematerialinterface.焊缝/母材界面上的未熔合aslaginclusioninthefarsideoftheweld.焊缝中心的夹杂anundercutconditiononthefarsideoftheweld.探头对侧焊缝的咬边Undertheconditionabove,butwiththeindicationata6In.Soundpathdistanceandwiththeexitpoint5.2In.Fromtheweldcenterlineanotherstrongindicationisreceivedindicatingaprobablereflectorinthe（）theweld.按上述条件，如接收到另一个很强的信号，声程为6英寸，探头焊缝距离为5.2英寸，表明在什么部位可能有反射体？rootareaof根部crownareaof盖面区midsectionof中部basemetaladjacent邻近的母材区Undertheconditionsabove,butwiththeindicationatasoundpathdistanceof9in.andwiththeexitpoint8.1in.fromtheweldcenterline,thereflectorliesinaplanethatis（）in.fromthecenteroftheweld.按上题条件，信号的声程为9英寸，探头焊缝距离为8.1英寸，则反射体所处的平面离焊缝中心线（）英寸。0.1（onthefarside）0.1（探头远侧）0.3（onthenearside）0.3（探头近侧）0.3（onthefarside）0.3（探头远侧）0.5（onthenearside）.0.5（探头近侧）Undertheconditionabove,thereflectorisatadepthof按上题条件，反射体的深度为（）。1.5in.1.0in.2.0in.2.25in.Inathick-walledpipingweldinspection,thecounter-boreontheIDreflectstheincident45-degreeshearwavesothatitstrikesthetopsurfaceatnormalincidence.Inorderforthistohappen,thetaperonthecounter-boremustbe在厚壁管道焊缝探伤中，内壁镗孔斜坡面，会对入射横波产生反射，如45的横波刚好被反射到垂直入射至上表面，则坡面与底面夹角应为()。30degree.30°45degree.45°11.25degree.11.25°22.5degree.22.5°Undertheabovecondition,anL-waveisinternallymodeconvertedatananglewiththesinYgivingby按上题条件，也会以Y角形成转换的纵波，则sinY由公式()给出。sinY=(CL/CS)sin(incidentangle).sinY=(CL/CS)sin(入射角)sinY=(CL/CS)sin45degree.sinY=(CL/CS)sin45°sinY=(CL/CS)sin90degree.sinY=(CL/CS)sin90°sinY=4sin45(incidentangle).sinY=4sin(入射角)A1.5in.buttweldistobeexaminedfrombothsidesusinga70-degreeshearwave.Thescanprogramcallsforbeingabletoinspect3legs(1.5Veepaths).Weldaccessforcompletingthispatternwillrequire()plusthephysicaldimensionsofthetransducerassembly.采用70°横波从焊缝两侧检验1.5英寸厚对接焊缝，前后扫查可以作到三次波(1.5倍V声程)探伤，为完成这样的扫查，焊缝每侧接近距离(探头移动区)应为()，再加上探头组件的几何尺寸。A.4.5in.B.8.24in.C.12.36in.D.24.73in.Thesoundpathsweepsettingonthe10divisionCRTfortheabovecaseshouldbe荧光屏上声程扫描调节为10个分格，按上题情况，每分格应为()。1.35in./div.1.00in./div.1.25in./div.0.50in/div.ThreemajorsourcesofnoisewhichinterferewiththesignalsontheCRTare超声波现场检验中，干扰荧光屏信号的三个主要噪声源是()。frontsurfaceroughness,hydraulicmotors,andenlargedgrainstructure.检测面粗糙、水压机、粗晶组织backsurfaceroughness,electricmotors,anddecreasedgrainstructure.底面粗糙、电动机、细晶组织depth,sizeandlocationofdefect.缺陷的深度、尺寸和位置frontsurfaceroughness,arcweldingoperation,andenlargedgrainstructure.检测面粗糙、弧焊操作、粗晶组织Referencestandardsaretobeconstructedfrommaterialsthat().(Art.5sectionVASMECode)制作参考试块(校准试块)的材料应()。camefromthesameheatasthetestparts与被检工件热处理相同haveasimilarmetallurgicalstructureasthetestparts与被检工件具有相似的金相组织arethesamematerialspecification,grade,andheattreatmentasparts与被检工件有相同的材料规范、等级和热处理areofsamethicknessasthetestparts与被检工件厚度相同Scanningpracticescallfortransducerpositionsto超声波检验中，扫查时要求怎么样移动探头？()befromtwoorthogonaldirection.从两个互相垂直的方向扫查overlapeachotherby10persent.相邻轨迹的复盖率要达到10%n