ASME UTⅡ级基础试题.docx

1、ASME UT级基础试题Filled in by the trainee: 下列各项由参加基础考试人填写： Name： Date： 姓名： 考试日期： Filled in by the evaluator: 下列各项由参加评分人填写： Score： Evaluator ： 得分： 评分人： （40题，每题2.5分） 1The length of the zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by: 靠近换能器的声压波动区域的长度主要取决于： A

2、.the frequency of the transducer. 换能器的频率 B.The diameter of the transducer. 换能器的直径 C.The length of transducer cable. 换能器电缆的长度 D.both A and B. A 和 B 2The differences in signal received from identical reflectors at different material distances from a transducer may be caused by: 换能器从埋藏深度不同的相同反射体接收的信号差别

3、可能由哪种原因引起的？ A.material attenuation. 材料衰减 B.beam divergence. 声速扩散 C.near field effects. 近场效应 D.all of the above. 以上都是 3Which of the following may result in 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 surface? 在细

4、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.Multiple indications before the first back reflection. 一次底波反射前出现许多信号显示 B.Indications from multiple surface reflections. 产生多次表面反射信号 C.Conversion from the longitudinal mode to shear mode. 纵波转变成横波 D.Loss of front surface reflections. 表面信号衰减 4If a contact angle

5、 beam transducer produces a shear wave in steel, the angle produced by the same transducer in an 45 aluminum specimen would be sec) sec; VsAL=0.310cm/ Vssteel=0.323/ 切变波，该探头在铝中产生的切变波角度为 如果一个接触式斜探头在钢中产生45 （已知：Vs钢=0.323cm/微秒; Vs铝=0.310cm/微秒） . A.less than 45 小于45 B.Greater than 45 大于45 C.45 45 D.more

6、information is required. 还需要其它数据才能确定 5In which ultrasonic test method the finger damping is the most effective for locating a discontinuity is: 在哪种超声探伤法中用手指衰减法确定缺陷位置最有效？ A.shear wave. 切变波 B.Longitudinal wave. 纵波 C.Surface wave. 表面波 D.Compress ional wave. 兰姆波 6At an interface between two different ma

7、terials, an impedance difference results in : 在两种不同材料的界面上，声阴抗差会引起： A.reflection of the entire incident energy at the interface. 入射能量在界面上全部反射 B.Absorption of sound 声波被吸收 C.Division of sound energy into transmitted and reflected modes. 声能分为透过波和反射波两部分 D.None of the above. 以上都不是 7In the immersion techni

8、que, the distance between the face of the transducer and the test surface(water path) is usually adjusted so that the time required to send the soudbeam through the water: 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时间： A.is equal to the time required for the sound to travel through the test piece. 等于声波在工

9、件中的传播时间 B.Is greater than the time required for the sound to travel through the test piece. 大于声波在工件中的传播时间 C.Is less than the time required for the sound to travel through the test piece. 小于声波在工件中的传播时间 D.None of the above. 以上都不是 8On an A-scan display, the “dead zone” refers to: 扫描显示中，“死区”是指： A.the di

10、stance contained within the near field. 的场所包含的距离 B. the area outside the beam spread. 声束扩散角之外的区域 C. the distance covered by the front surface pulse width and recovery time. 前表面脉冲宽度和恢复时间所覆盖的距离 D.The area between the near field and the far field. 近场与远场之间的区域 9In straight (normal) beam contact testing,

11、a reduction in the back surface reflection amplitude could indicate: 接触法垂直探伤中，底波幅度降低的原因可能是： A.inadequate coupling. 耦合不良 B.a flaw which is not normal to the beam. 存在与声束不垂直的缺陷 C.a near surface defect that cannot be resolved from the main bang (initial pulse). 存在与始脉冲不能分开的近表面缺陷 D.all of the above. 以上都是

12、10. Compensation for the variation in echo height related to variations in discontinuity depth in the test material is known as: 对于因缺陷深度变化而引起的回波高度变化进行补偿称为： A.transfer. 传输 B.Attenuation. 衰减 C.Distance amplitude correction. 距离振幅修正 D.Interpretation. 解释 11Which of the following is a reference reflector

13、that is not dependent on beam angle? 下列哪种参考反射体与声束角度无关 A.A flat bottomed hole 平底孔 B.A vee notch V型缺口 C.A side drilled hole which is parallel to the plate surface and perpendicular to the sound path. 平行于板材表面且垂直于声束的横孔 D.A dice shaped laminar reflector. 圆片状分层反射体 12A discontinuity is located having an or

14、ientation such that its long axis is parallel to the sound beam. The indication from such a discontinuity will be: 探测长轴与声束平行的缺陷时，缺陷显示： A.large in proportion to the length of the discontinuity. 与缺陷长度关系很大 B.small in proportion to the length of the discontinuity. 与缺陷长度关系不大 C.representative of the lengt

15、h of the discontinuity. 代表缺陷的长度 D.such that complete loss of back reflection will result. 使底反射消失 13As transducer diameter decreases, the beam spread: 换能器直径减小时，声束扩散角： A.Decreases. 减少 B.Remains the same. 不变 C.Increases. 增大 D.Becomes conical in shape. 变为圆锥形的 refraction of a longitudinal soundwave 14The

16、 angle at which 90 is reached is called: 折射纵波的声束入射角叫做： 发生90 A.the angle of incidence. 入射角 B.the first critical angle. 第一临界角 C.the angle of maximum reflection. 最大反射角 D.the second critical angle. 第二临界角 15Large grains in a metallic test specimen usually result in: 金属零件中粗大晶粒通常会引起 A.decrease or loss of b

17、ack surface reflection. 底反射降低或消失 B.large “hash” or noise indications. 较高的“杂波”或噪声显示 C.decrease in penetration. 穿透力降低 D.all of the above. 以上都是 16Acoustical lenses are used commonly for contour correction. When scanning the inside of a pipe section by the immersion method, which of the following lens t

18、ypes would be used? 声透镜常用来修正声束形状，用液浸法从管子内壁进行探伤时，应使用哪咱类型的透镜？ A.focused cup. 聚焦杯 B.Convex 聚焦点 C.Concave 凹透镜 D.Variable pitch 可变节距透镜 17In a water immersion rest, ultrasonic energy is transmitted into steel at .What is the angle of the refracted shear wave within an incident angle of 14 the material? 10

19、5cm/sec 105cm/secVw=1.5 Vs=3.2 ，钢件中的横波折射角为多大？ 钢件水浸探伤时，超声波入射角为14 105cm/秒 （已知V=3.2 105cm/秒，可使用三角函数表） Vw=1.5 B. 23 A. 45 D. C. 31 13 18The angular position of the reflecting surface of a planar discontinuity with respect to the entry surface is referred to as: 平面型缺陷的反射表面相对于入射角表面的角度位置叫做： A.the angle of

20、incidence. 入射角 B.The angle of refraction. 折射角 C.The orientation of the discontinuity. 缺陷的取向 D.None of the above. 以上都不是 19In ultrasonic testing, the time duration of the transmitted pulse is referred to as : 超声试验中，发射脉冲的持续时间叫做： A.the pulse length or pulse width. 脉冲长度或脉宽度 B.The pulse amplitude. 脉冲振幅 C.

21、The pulse shape. 脉冲形状 D.None of the above. 以上都不是 20In general, shear waves are more sensitive to small discontinuities than longitudinal waves for given frequency and in a given material because: 一般来说，在频率和材料一定的情况下，切变波对小缺陷的灵敏度比纵波高，这是因为： A.the wavelength of shear waves is shorter than the wavelength o

22、f longitudinal waves. 切变波的波长比纵波波长短 B.Shear waves are not as easily dispersed in the material. 切变波在材料中不易发生发散 C.The direction of particle vibration for shear waves is more sensitive to discontinuities. 切变波的质点振动方向对缺陷比较敏感 D.The wavelength of shear waves is longer than the wavelength of longitudinal wave

23、s. 切变波的波长比纵波波长长 21In general, which of the following modes of variation would have the greatest penetrating power in a coarse-grained material if the frequency of the waves are the same? 在频率相同的情况下，下列哪种波在粗晶材料中的穿透力最大？ A.Longitudinal wave 纵波 B.Shear wave 切变波 C.Transverse wave 横波 D.All of the above mode

24、s would have the same penetrating power. 以上波都相同 22The amount of energy reflected from a discontinuity will be dependent on: 缺陷反射的超声能量大小取决于： A.the size of the discontinuity. 缺陷尺寸 B.The orientation of the discontinuity. 缺陷方向 C.The type of discontinuity. 缺陷类型 D.All of the above. 以上都是 23When inspecting

25、a rolled or forged surface with a thin scale that is generally tightly adhering to the part, what is necessary to do before testing the part? 滚轧或锻造零件超声探伤时，如果零件表面紧密地粘附一层薄氧化皮，探伤前需要： A.clean the surface of loose scale. 将松散的氧化皮清理掉 B.Have all scale removed. 将所有的氧化皮清理掉 C.Rough machine the surface. 表面粗加工 D

26、.Caustic etch the surface. 用苛性碱腐蚀表面 24Properties of shear or transverse waves used for ultrasonic testing include: 超声探伤中使用的切变波或横波的性质包括 A.Particle motion normal to propagation direction, and propagation velocity which is about 1/2 the longitudinal wave velocity in the same material. 质点振动垂直于传播方向，传播速度约

27、为同材料中纵波速度的1/2 B.Exceptionally high sensitivity due to low attenuation resulting from longer wavelengths when propagating through water. 由于水中传播时声波波长较长，衰减较小，所以灵敏度特别高 C.High coupling efficiency because shear waves are less sensitive to surface variables when traveling from a coupling liquid to the part

28、. 由于切变波从耦合液进入零件时表面的变化不太敏感，所以耦合效率高。 D.None of the above statements apply to shear waves. 以上说法均不适用于切变波 25At a .The principal water-to-steel interface the angle of incidence in water is 7 mode of vibration that exists in the steel is : ，钢中的主要波型为： 在水/钢界面上，超声波在水中的入射角为7 A.Longitudinal 纵波 B.shear. 切变波 C.Bo

29、th A and B above A 和B D.Surface 表面波 26In a basic pulse-echo ultrasonic instrument, the component that produces visible signals on the CRT which are used to measure distance is called a: 在脉冲反射式超声探伤仪示波管上产生测量距离用的可见信号的单元叫做： A.sweep circuit. 扫描电路 B.Marker circuit. 标距电路 C.Receiver circuit. 接收电路 D. Synchro

30、nizer. 同步电路 27In an ultrasonic instrument, the number of pulse produced by an instrument in a given period of time is known as the: 超声探伤仪在单位时间内产生的脉冲数目叫做： A.pulse length of the instrument. 脉冲长度 B.Pulse recovery time. 脉冲恢复时间 C.Frequency. 频率 D.Pulse repetition rate. 脉冲重复频率 28Which of the following modes of vibration are quickly damped out when testing by the i