UT-Ⅲ级方法考试试卷

-1-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)1.Acouplantisneededforatestonahotsteelplate(250°F).Whichofthefollowingmaterialscanbeused?下列那种材料可用作热钢板（120℃）检验的耦合剂？（）A.Water水B.Mercury水银C.tractoroil机油D.noneoftheabove以上都不行。2.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？（）A.acouplantfreeofchlorine无氯的耦合剂B.glycerine甘油C.oil油D.water水。3.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？（）A.7in.（英寸）B.2in.（英寸）C.3-1/3in.（英寸）D.5-1/2in.（英寸）4.Aconcavelensonatransducerwillresultinthenearfieldinwaterbeing换能器前的凹透镜会使声场在水中的近场长度变成（）。A.twiceaslongaswithaflatlens.平透镜的两倍。B.threetimesaslongaswithaflatlens.平透镜的三倍。C.thesamelengthaswithaflatlens.与平透镜一样。D.shorterthanwithaflatlens.短于平透镜近场长度。5.A10MHz,0.5in.dia.,searchunitisplacedonsteelandacrylicplasticinsuccession.Thebeamspreadinthesetwomaterialsisapproximately-2-10MHz,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（）。A.3and1.5degrees,respectively.分别为3°，1.5°。B.1.5and3degrees,respectively.分别为1.5°，3°。C.equalinthetwomaterials.在两种材料中相同。D.lessthanthebeamspreadof15MHzsearchunitofthesamediameter.比15MHz同直径探头扩散角小。6.Inanimmersiontestofcommerciallypuretitaniumplate(Cl=6100m/s),anechopulsefromaninternaldefectisobserved6.56µsecfollowingthefrontsurfaceecho.Howdeepisthereflectorbelowthefrontsurface?钛板（CL=6100m/s）水浸探伤中，在第一次表面回波后6.56μs.观测到一个內部缺陷波，求反射体在表面下多深？（）A.2cmB.4cmC.1cmD.2in.7.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.8.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（）。A.70%FSHto14%FSH满屏高70%到14%B.100%FSHto50%FSH满屏高100%到50%C.100%FSHto20%FSH满屏高100%到20%D.100%FSHto25%FSH满屏高100%到25%9.Platethickness=25.4mm,pulse-echo,straightbeammeasuredelapsedtime=8µs.Whatisthemostlikelymaterial?板厚为25.4mm，直探头测得的脉冲回波时间为8μs，则板的材料最可能为（）。A.carbonsteel碳钢B.lead铅C.titanium钛D.aluminum铝10.Thetransmittedpulseattheoutputofthepulserusuallyhasavoltageof100to1000V,whereasthevoltageoftheechoattheinputoftheamplifierareontheorderof-3-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()。A.10volts.10伏B.50volts.50伏C.0.001to1volts.0.001～1伏D.1to5volts.1～5伏11.Whichofthefollowingmightresultinincreasedtransmissionofultrasoundwithinacoarse-grainedmaterial?下列哪种方法可增大超声波在粗晶材料的穿透力？（）A.Performtheexaminationwithasmallerdiametertransducer用直径较小的探头进行检验；B.Performtheexaminationafteragrainrefiningtreatment在晶粒细化热处理后进行检验；C.Changefromacontactexaminationtoanimmersionexamination将接触法检验改为液浸检验；E.Changefromalongitudinaltoatransversewave将纵波检验改为横波检验。12.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？A.1B.1/2C.1/10D.1/10013.Thesensitivityofanultrasonictestsystem超声波试验系统的灵敏度（）。A.dependsonthesearchunit,pulser,andamplifierused.取决于探头、脉冲发生器和放大器B.decreasesasthefrequencyisincreased.随频率提高而降低C.increasesastheresolutionincreases.随分辨力提高而提高D.isnotrelatedtomechanicaldampingofthetransducer.与换能器的机械阻尼无关系14.Searchunitsensitivityismostoftendeterminedby确定探头灵敏度最常用的方法是（）。A.calculationsbasedonfrequencyandthicknessofpiezoelectricelement依据频率和压电晶片的厚度进行计算B.theamplitudeoftheresponsefromanartificialdiscontinuity用来自人工缺陷的回波信号振幅确定C.comparingittoasimilarsearchunitmadebythesamemanufacture与同一厂家制造的同种探头进行比较D.determiningtheringingtimeofsearchunit确定探头的振荡时间15.NotchesprovidegoodreferencediscontinuitywhenUTexaminationisconductedtoprimarilydetectdefectssuchas探测哪种缺陷时可用缺口作为一种良好的参考缺陷？（）A.porosityinrolledplate.滚轧板材的疏松-4-B.inadequatepenetrationattherootofaweld.焊缝根部的未焊透C.weldporosity.焊缝中的气孔D.internalinclusion.内部夹杂16.Thedifferencebetweenacompressionandshearwaveis压缩波和切变波之间的区别是()。A.quantitativemeasure.定量测量B.particledirection.质点振动方向C.qualititativemeasure.定性测量D.amplitude.振幅17.TheparticlemotionforRayleighwavesisusuallydescribedas瑞利波的质点振动是()。A.sinusoidal.正弦的B.circular.圆形的C.elliptical.椭圆形的D.shear.剪切形的18.Baseduponwavetheoryandignoringattenuationlosses,theechoamplitudeis按照波动理论，在忽略衰减损耗的情况下，回波振幅（）。A.directlyproportionaltothedistancetothereflector.与反射体的距离成正比B.inverselyproportionaltothedistancetothereflector.与反射体的距离成反比C.directlyproportionaltothesquareofthedistancetothereflector.与反射体的距离的平方成正比D.inverselyproportionaltothesquareofthedistancefromthereflector.与反射体的距离的平方成反比19.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？（）A.1–10volts.1～10伏B.10–100volts.10～100伏C.100–1000volts.100～1000伏D.1000–3000volts.1000～3000伏20.Asyouincreasethefrequencyofagivensizetransducer,换能器尺寸不变而频率提高时，（）。A.thelateralresolutionisimpaired.横向分辨力降低B.thebeamdivergenceincreases.声束扩散角增大-5-C.thelengthofthenearfieldincreases.近场长度增大D.thesensitivityincreases.灵敏度提高21.Whichfrequencycanbestdistinguishthed