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1、超声 II级基础理论试卷UT Level II General Examination姓名：答卷时间：地点：NameTimeLocation得分：评卷人：时间：MarksExaminerDate1. 超声波探伤中，最常用的换能器应用的原理是： ( B )A) 磁致伸缩原理 B) 压电原理 C) 波型转换原理 D) 以上都不是 The transducers most commonly found in ultrasonic search units (probes) used for discontinuity testing utilize:A) magnetostriction princ
2、iples B) piezoelectric principlesC) mode conversion principles D) none of the above 2. 下列哪种声波具有多种不同的波速 ( D )A) 纵波 B) 切变波 C) 横波 D) 兰姆波Of the following sound wave modes, which one has multiple or varying wave velocitiesA) longitudinal wavesB) shear wavesC) transverse wavesD) lamb waves3. 下列哪种情况可应用超声技术
3、进行检测 ( D )A) 确定材料弹性模量 B) 研究材料冶金组织 C) 测量材料厚度 D) 以上都可以 Which of the following would be considered application(s) of ultrasonic techniquesA) determination of a materials elastic modulus B) study of a materials meallurgical structure C) measurement of a materials thicknessD) all of the above4. 可在液体中传播的唯
4、一声波是： ( B )A) 切变波 B) 纵波 C) 表面波 D) 瑞利波The only significant sound wave mode that will travel through a liquid is:A) shear B) longitudinalC) surfaceD) rayleigh5. 材料的声阻抗用来： ( C )A) 确定界面上的折射角 B) 确定材料的声衰减 C) 确定界面上透过和反射声能的相对数量 D) 确定材料中声束扩散角 The acoustic impedance of a material is used to:A) determine the a
5、ngle of refraction at an interfaceB) determine the attenuation within the materialC) determine the relative amounts of sound energy coupled through and reflected at an interfaceD) determine the beam spread within the material6. 对试样进行接触法斜角探伤时，如果入射角达到第二临界角，会发生： ( C ) A) 表面波全反射 B) 切变波45折射C) 表面波 D) 以上都不
6、对When angle beam contact testing a test piece, increasing the incident angle until the second critical angle is reached results in:A) total reflection of a surface waveB) 45 refraction of the shear waveC) production of a surface waveD) none of the above7. 接触法探伤中，靠近入射表面的缺陷并不是总能探测出来的，其原因是： ( C )A) 远场效
7、应 B) 衰减 C) 盲区 D) 折射In contact testing, defects near the entry surface cannot always be detected because of:A) the far-field effectB) attenuation C) the dead zone D) refraction8. 换能器频率与晶片厚度有关，晶片愈薄： ( B )A) 频率愈低 B) 频率愈高 C) 频率无显着差别 D) 以上都不对The crystal thickness and transducer frequency are related, the
8、 thinner the crystal:A) the lower the frequency B) the higher the frequencyC) there is no appreciable affect D) none of the above9. 靠近换能器的声压波动区域的长度主要取决于： ( D )A)换能器的频率 B)换能器的直径 C)换能器电缆的长度D) A和BThe length of the Zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly aff
9、ected by:A) the frequency of the transducerB) the diameter of the transducerC) the length of transducer cableD) both A and B10. 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是由哪种原因引起的 ( D )A) 材料衰减B) 声束扩散 C) 近场效应D) 以上都可能The differences in signals received from identical reflectors at different material distances from a t
10、ransducer may be caused by:A) material attenuation B) beam divergence C) near field effects D) all of the above11. 探头横向移动时，比探头尺寸小的缺陷产生的信号振幅发生起伏的变化。在哪个区域探伤时可能发生这种情况( B )A) 费朗霍夫区B) 近场区C) 斯奈尔区D) 阴影区It is possible for a discontinuity smaller than the transducer to produce indications of fluctuating ampl
11、itude as the search unit is moved laterally, if testing is being performed in the:A) Fraunhofer ZoneB) Near fieldC) Snell fieldD) Shadow zone12. 液浸探伤时，采用哪种方法可消除探头近场的影响( C )A) 提高频率 B) 使用直径较大的探头 C) 采用合适的水距 D) 使用聚焦换能器In immersion testing, the near field affects of a transducer may be eliminated by:A) i
12、ncreasing transducer frequencyB) use of a larger diameter transducerC) using an appropriate water pathD) use of a focused transducer13. 图1中，假定探头声束是均匀的，点A和点B分层缺陷反射信号振幅之间存在什么关系(C )A)相差12dBB)振幅相同C)二比一D)三比一分层缺陷 Laminar reflectorIn Figure 1 shown below, assuming a uniform beam pattern, what relationship
13、would you expect to exist between the amplitudes of the reflected laminar signals at position A and BA) 12dB differenceB) Equal amplitudesC) 2 to 1D) 3 to 114. 在均匀的超声波束的远场中，声束中心线上的声强度：( B )A) 最低B) 最高C) 在2Y角度内声强度最高SinY=C/Df式中C为声速，D为晶片直径，f为频率D) 与中心线的方向无关In the far field of uniform ultrasonic beam, sou
14、nd intensity is the beam centerlineA) minimum at B) maximum atC) maximum throughout twice the angle(Sin Y =c/ Df) where C is acoustic velocity, D is crystal diameter, and B is frequency atD) not related to orientation of15. 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A) 一次底面反射前出现许多信号显示B) 产生多次表面反射信号C) 发
15、生纵波变为切变波的波型转换D) 前表面反射降低Which of the following may result on a long narrow rod if the beam divergence results in a reflection from a side of the test piece before the sound wave reaches the back surfaceA) multiple indications before the first back reflectionB) indications from multiples surface reflectionsC) conversion from the longitudinal mode to shear modeD) loss of front surface indications16. 声束在何处发生扩散( B )A) 近场B) 远场C) 晶片上D) 以上都不是Where does beam divergence occurA) near fieldB) far fieldC) at the crystalD) none of the above17. 在直径一定的情况下，当晶片频率提高时，声束扩散角将：(
