asme ut ⅱ级基础试题.doc

asme ut ⅱ级基础试题.docASMEUT-II级基础试题ASMEUT-U级基础试题Filledinbythetrainee:下列各项由参加基础考试人填写:Name:姓名:Date:考试日期:Filledinbytheevaluator:下列各项由参加评分人填写:Score:得分:Evaluator:评分人:(40题,)urismostlyaffectedby:靠近换能器的声压波动区域的长度主要取决于:thefrequencyofthetransducer・换能器的频率Thediameterofthetransducer・换能器的直径C・The1engthoftransducercable・:换能器从埋藏深度不同的相同反射体接收的信号差别可能由哪种原因引起的?・声速扩散nearfieldeffects・近场效应alloftheabove・以上都是Whichofthefollowingmayresultinalongnarrowrodifthebeamdivergenceresultsinareflectionfromasideofthetestpiecebeforethesoundwavereachesthebacksurface?在细长的棒中,如果由于声束扩散而使声束到达底面前在试件侧面发生反射,会发生什么情况?・产生多次表面反射信号Conversionfromthelongitudinalmodetoshearmode・纵波转变成横波Lossoffrontsurfacereflections・表面信号衰减Ifacontactanglebeamtransducerproducesa45?shearwaveinsteel,/?sec;VsAL=/?sec)如果一个接触式斜探头在钢中产生45?切变波,该探头在铝中产生的切变波角度为(已知:Vs钢=;Vs铝=)lessthan45?・小于45?Greaterthan45?大于45?45?45?moreinformationisrequired・还需要其它数据才能确定Inwhichultrasonictestmethodthefingerdampingisthemosteffectiveforlocalingadiscontinuityis:在哪种超声探伤法中用手指衰减法确定缺陷位置最有效?shearwave・切变波Longitudinalwave・纵波C・Surfacewave・pressionalwave・兰姆波Ataninterfacebetweentwodifferentmaterials,animpedancedifferenceresultsin:在两种不同材料的界面上,声阴抗差会引起:reflectionoftheentireincidentenergyattheinterface・入射能量在界面上全部反射Absorptionofsound声波被吸收Divisionofsoundenergyintotransmittedandreflectedmodes・声能分为透过波和反射波两部分Noneoftheabove・以上都不是Intheimmersiontechnique,thedistancebetweenthefaceofthetransducerandthetestsurface(waterpath)isusuallyadjustedsothatthetimerequiredtosendthesoudbeamthroughthewater:液浸探伤时,需要调整探头和被检零件表面之间的距离(水距),使声波在水中的传播吋间:isequaltothetimerequiredforthesoundtotravelthroughthetestpiece・等于声波在工件中的传播吋间Isgreaterthanthetimerequiredforthesoundt