1、UT II级基础理论试题UT II级基础理论试题UT Level II General Examination姓名：_得分：_ 主考官：_Name Score Examiner1. 以下哪项可视为超声技术的应用：Which of the following would be considered application(s) of ultrasonic techniques:A. 测材料的弹性模量Determination of a materials elastic modulus B. 研究材料的冶金结构 Study of a materials metallurgical structu
2、re C. 材料厚度测量 Measurement of a materials thickness D. 以上都是 All of the above 2. 可在液体中传播的波型是：The only significant sound wave mode that will travel through a liquid is:A. 剪切波 Shear B. 纵波 LongitudinalC. 表面波 Surface D, 瑞利波 Rayleigh3. 材料的声阻抗用于：The acoustic impedance of a material is used to:A. 确定在界面上的折射角De
3、termine the angle of refraction at an interfaceB. 确定材料内部的衰减Determine the attenuation within the materialC. 确定界面上反射和穿越声波的相对能量值Determine the relative amounts of sound energy coupled through and reflected at an interfaceD. 确定材料内的声束传播Determine the beam spread within the material4. 斜探头耦合到试件上，增大入射角直至第二临界角
4、，则：When angle beam contact testing a test piece. Increasing the incident angle until the second critical angle is reached results in:A. 表面波全反射Total reflection of a surface waveB. 横波产生45折射 45refraction of the shear waveC. 产生表面波Production of a surface waveD. 以上全是All of the above5. 以下各类声波中，哪种具有多种或变化的波速
5、：Of the following sound wave modes , which one has multiple or varying wave velocities:A. 纵波 Longitudinal waveB. 横波 Shear waveC. 剪切波 Transverse waveD. 兰姆波 Lamb wave6. 晶片厚度与幅射频率的关系是，晶片越薄：The crystal thickness and transducer frequency are related , The thinner the crystal:A. 频率越低 The lower the frequen
6、cyB. 频率越高 The higher the frequencyC. 无明显效果 There is no appreciable affectD. 以上全不对 None of the above 7. 与换能器相邻的声压振荡区域，其长度受哪些影响：The length of the zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by:A. 换能器的频率The frequency of the transducerB. 换能器的直径The diame
7、ter of the transducerC. 换能器电缆长度The length of transducer cableD. A和B A and B8. 频率增加时，给定晶片的声束扩散角度会：As frequency increases in ultrasonic teasting ,the angle of beam divergence of a given diameter crystal:A. 减小 DecreasesB. 保持不变 Remain unchargedC. 增加 IncreasesD. 按每种波长均匀变化 Varies uniformly through each wa
8、velength9. 在液浸中，近场可用以下哪种方法消除：In immersion testing , the near field effects of a transducer may be eliminated byA. 增加换能器的频率Increasing transducer frequencyB. 用大尺寸晶片Use of a larger diameter transducer C. 采用适当的水层厚度Using an appropriate water pathD. 采用聚焦探头Use of a focused transducer10. 纵波沿着与法线成5角的方向由水中入射到
9、钢中，则折射横波：A longitudinal ultrasonic wave is transmitted from water into steel at an angle of 5from the normal , in such cases , the refracted angle of the transverse wave is:A. 小于纵波折射角 Less than the refracted angle of the longitudinal waveB. 等于纵波折射角 Equal to the refraetead angle of the longitudinal w
10、aveC. 大于纵波折射角Greater than the longitudinal waveD. 根本没有 Not present at all11. 声束在哪里产生扩散Where does beam divergence occurA. 近场 Near field B. 远场 Far fieldC. 晶片处 At the crystalD. 以上全不对 None of the above12. 用垂直于其表面的声波检测薄层时，应观察：Thin sheet may be inspected with the ultrasonic wave directed normal to the sur
11、face by observing;A. 前界面反射波幅 The amplitude of the front surface reflectionB. 多重反射波形 The multiple reflection patternC. 所有的前界面反射 All front surface reflectionsD. 以上全不是 None of the above13. 瑞利波对位于哪里的缺陷最敏感：Rayleigh waves are influenced most by defects located:A. 表面下一个波长内One wavelength below the surface B
12、. 表面下六个波长内Six wavelength below the surfaceC. 表面或近表面Close to or on the surface D. 表面下三个波长内there wavelength below the surface14. 兰姆波可用来检查：Lamb waves can be used to detect:A. 薄工件中近表面分层Laminur-type detects near the surface of a thin materialB. 厚焊件中心部位的未熔合Lack of fusion in the center of a thick weldmentC
13、. 熔合面上的空隙Internal voids in diffusion bondsD. 重板材的厚度变化Thickness changes in heavy plate material15. 哪种定律可计算纵波和横波的折射角：What law can be used to calculate the angle of refraction within a metal for both longitudinal and shear waves:A. 泊松比定律 Poissons Ratio LawB. 斯涅尔定律 Snells LawC. 弗朗活费定律 Fresnels Field Law
14、D. 查理定律 Charles Law16. 直探头检测上下表面不平行的工件时会引起：During straight beam testing ,test specimens with non-parallel front and back surfaces can cause:A. 底波部分或全损失Partial or total loss of back reflectionB. 底波无损失No loss in back reflectionC. 底波显示信号变宽A widened ( broad )back reflection indicationD. 底波显示信号会聚A focuse
15、d (narrow) back reflection indication17. 在B扫描中，不连续的屏幕显示长度与哪项相关：In a B-scan display , the length of a screen indication from a discontinuity is related to :A. 平行于声束方向的厚度A discontinuitys thickness as measured parallel to the ultrasonic beam B. 探头移动方向上的长度The discontinuitys length in the direction of th
16、e transducer travel C. A和B A and B D. 非A和BNone of the above18. 以下哪项能产生关于缺陷面积的重迭的平面图：Of the following scan types , which one can be used to produce a recording of flaw areas superimposed over a plan view of the test piece;A. A扫描 A-scan B. B扫描 B-scanC. C扫描 C-scan D. D 扫描 D-scan19. 参考试块的主要目的：Aprimary p
17、urpose of a reference standard is:A. 为了校对仪器以便能发现有害缺陷To provide a guide for adjusting instrument controls to reveal discontinuities that are considered harmful to the end use of the productB. 作为工具可以给操作者提供缺陷的实际大小To give the technician a tool for determining exact discontinuity size C. 确保可测得的不连续小于相应的反射
18、体To provide assurance that all discontinuities smaller than a certain specified reference reflectD. 可提供标准反射体，它可以模拟具有临界尺寸的真实不连续性To provide a standard reflector which exactly simulates natural discontinuities of a critical size20. 以下压电材料中，声接收性能最好的是：Of the piezoelectric materials listed below , the mos
19、t efficient sound receiver is:A. 硫酸锂 Lithium sulfateB. 石英 QuartzC. 钛酸钡 Barium titanateD. 氧化银 Silver oxide21. 以下压电材料中，传声性能最好的是：Of the piezoelectric materials listed below , the most efficient sound transmitter is:A. 硫酸锂 Lithium sulfateB. 石英 QuartzC. 钛酸钡 Barium titanateD. 氧化银 Silver oxide22. 一套标准试块，除了
20、反射体（例如：平底孔）的尺寸不同外具有相同的外形和尺寸，则此套试块为：A set of standard reference blocks with the same geometrical configuration and dimensions other than the size of the calibration reflectors, e.g flat bottom holes is called a set of ;A. 距离一波幅型Distance-amplitude standardsB. 面积一波幅型Area-amplitude standardsC. 可变频率的试块Va
21、riable frequency blocksD. 声束传播测量试块Beam spread measuring blocks23. A-型显示UT仪器当中， 控制示波器的垂直偏转板上的电压的是：Which of the following controls the voltage supplied to the vertical deflection plates of theCRT in an A-scan UT setup:A. 扫描发生器 Sweep generatorB. 脉冲 pulseC. 放大电路 amplifier circuitD. 时钟 clock timer24. UT仪
22、器垂直线性可以通过测以下哪项的响应回波来获得：The vertical linear range of a test instrument may be determined by obtaining ultrasonic responses from:A. 一套距离-幅度参考试块A set of distance-amplitude reference blocksB. 不同水距处的小钢球Steel balls located at several defferent water path distancesC. 一套面积-幅度参考试块A set of area-amplitude refe
23、rence blocksD. 以上全是All of the above25. 大晶粒金属材料常会引起：Large grains in a metallic test specimen usually result in:A. 底波的减小或损失Decrease or loss of back surface reflectionB. 大的杂波或噪声Largehashor noise indicationsC. 穿透力减小Decrease in penetrationD. 以上全是All of the above26. 切割石英晶体以使其主面平行于Y和Z轴，垂直于X轴，此称为：A quartz c
24、rystal cut so that its major faces are parallel to the Z and Y axes and perpendicular to the X axis is called:A. Y切石英 A Y -cut crystal B. X切石英 An X -cut crystalC. Z切石英 A Z -cut crystalD. ZY切石英 A ZY -cut crystal27. 某种材料所具有的可以将电能转变为机械能（反之亦然）的特性叫做：The property of certain materials to transform electric
25、al energy to mechanical energy and vice A. 模式转换 mode conversionB. 压电效果 piezoelectric effectC. 折射 refractionD. 阻抗匹配 impedance matching28. 对于铝和铜，纵波声速约为横波声速的_:For aluminum and steel the longitudinal velocity is approximately _the shear velocityA. 相同 equal toB. 二倍 twiceC. 一半 one-half of D. 四倍 four times
26、29. 将仪器调节至标准状态的过程是指： The process of adjusting an instrument or device to a reference standard is referred to as :A. 角度 angulationB. 扫查 scaningC. 距离-波幅变化修正 correcting for distance-amplitude variationsD. 定标 calibration30. 以下哪种情况会出现明显错误的超声测厚结果：Significant errors in ultrasonic thickness measurement can
27、occur if :A. 检测频率连续变化The test frequency is varying at a constant rateB. 传播声速的假设值与实际值有偏差The velocity of propagation deviates substantially from an assumed constant value for a givenC. 用水做耦合剂Water is employed as a couplant between the transducer and the part being measured D. 以上全不会出错None of the above
28、should cause errors31. 板材的斜探头扫查常常会漏掉：Angle beam testing of plate will often miss:A. 垂直于声束的裂纹 Cracks that are perpendicular to the soundwave B. 随机分布的夹层Inclusions that are randomly oriented C. 平行于上表面的分层Laminations that are parallel to the front surface D. 一串小缺陷A series of small discontinuities32. 在UT中
29、，脉冲的延续时间是指： In ultrasonic testing , the time duration of the transmitted pulse is referred to as:A. 脉冲长度或宽度The pulse length or pulse width B. 脉冲幅度The pulse amplitude C. 脉冲形状The pulse shapeD. 以上全不对None of the above 33. 声束入射到界面上，在同一界质中改变传播方向的现象称为： The phenomenon by which a wave strikes a boundary and
30、changes the first medium is called:A. 扩散 divergenceB. 阻抗 impedanceC. 角度 angulationD. 反射 reflection34. 声束从一种介质进入另一声速不同的介质时，方向改变的现象称为：The change in direction of an ultrasonic beam when it passes from one medium to another whose velocity differs from that of the first medium is called:A. 折射 refractionB. 膨胀 rarefactionC. 角度 angulationD. 反射 reflection 35. 用于激励压电晶片的脉冲，其宽度增加会引起：Increasing the length of the pulse used to activate the search unit will:A. 声
