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1、ASNT超声II级基础理论考试(答案)9 / 9 作者： 日期：个人收集整理，勿做商业用途超声II级基础理论试卷UT Level II General Examination姓名： 答卷时间： 地点：Name Time Location 得分： 评卷人： 时间：Marks Examiner Date1. 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 d
2、iscontinuity testing utilize: A) magnetostriction principles B) piezoelectric principles C) mode conversion principles D) none of the above2. 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 velocities? A) longitudinal waves B
3、) shear waves C) transverse waves D) lamb waves3. 下列哪种情况可应用超声技术进行检测？ ( 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 techniques? A) determination of a materials elastic modulus B) study of a materials meallurgical structure C)
4、measurement of a materials thickness D) all of the above4. 可在液体中传播的唯一声波是： ( 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) longitudinal C) surface D) 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
5、料中声束扩散角 The acoustic impedance of a material is used to: A) determine the angle of refraction at an interface B) determine the attenuation within the material C) determine the relative amounts of sound energy coupled through and reflected at an interface D) determine the beam spread within the mater
6、ial6. 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 wave B) 45 refraction of the shear wave C) production o
7、f a surface wave D) 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 effect B) 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
8、) 频率愈高 C) 频率无显著差别 D) 以上都不对 The crystal thickness and transducer frequency are related, the thinner the crystal: A) the lower the frequency B) the higher the frequency C) 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B The lengt
9、h of the Zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by: A) the frequency of the transducer B) the diameter of the transducer C) the length of transducer cable D) 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
10、上都可能 The differences in signals received from identical reflectors at different material distances from a transducer 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
11、尔区 D) 阴影区 It is possible for a discontinuity smaller than the transducer to produce indications of fluctuating amplitude as the search unit is moved laterally, if testing is being performed in the: A) Fraunhofer Zone B) Near field C) Snell field D) 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
12、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) increasing transducer frequency B) use of a larger diameter transducer C) using an appropriate water path D) 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12dB B) 振幅相同 C) 二比一 D) 三比一分层缺陷 Lamina
