UTII级专业理论试题

1、UT II 级专业理论试题UT Level II Specific Examination姓名： 得分： 主考官： Name Score Examiner1. 在接触法中，近表面缺陷不能检测到，因为：Which of the following would be considered application(s) of ultrasonic techniques:A. 远场的影响 Determination of a materials elastic modulusB. 衰减的影响Study of a materials metallurgical structureC. 死区的影响Meas

2、urement of a materials thicknessD. 折射All of the above2. 斜探法探板材常会漏掉：The only significant sound wave mode that will travel through a liquid is:A. 与声束方向垂直的裂纹B. 自由分布的夹杂 LongitudinalC. 平行表面的分层SurfaceD, 成串的小缺陷 Rayleigh3. 气体缺陷变为平行表面的平面状或其它形状，这是由于：The acoustic impedance of a material is used to:A. 轧制 Determ

3、ine the angle of refraction at an interfaceB. 机加工 Determine the attenuation within the materialC. 铸造Determine the relative amounts of sound energy coupled through and reflected at an interfaceD. 焊接Determine the beam spread within the material4. 大部分脉冲 UT 仪采用：When angle beam contact testing a test pie

4、ce. Increasing the incident angle until the second critical angle is reached results in:A. 自动读出设备Total reflection of a surface waveB. A 型显示45 refraction of the shear waveC. B 型显示Production of a surface waveD. C 型显示All of the above5. UT 仪应多久校验一次：Of the following sound wave modes , which one has multi

5、ple or varying wave velocities:A. 一个月Longitudinal waveB. 三个月Shear waveC. 六个月Transverse waveD. 十二个月Lamb wave6. 仪器校验应包括：The crystal thickness and transducer frequency are related , The thinner the crystal:A. 水平线性The lower the frequencyB. 垂直线性The higher the frequencyC. 屏高线性There is no appreciable affec

6、tD. 以上全部None of the above7. 哪种试块常用于测水平线性：The length of the zone adjacent to a transducer in which fluctuations in sound pressure occur is mostly affected by:A. IIWThe frequency of the transducerB. IOWThe diameter of the transducerC. 平行孔试块The length of transducer cableD. 以上全不对A and B8. 检查表面粗糙的物体，适合采用

7、下列哪种方式：As frequency increases in ultrasonic teasting ,the angle of beam divergence of a given diameter crystal:A. 较低频率，较稠耦合剂DecreasesB. 较高频率，较稠耦合剂C. 较高频率，较稀耦合剂D. 较低频率，较稀耦合剂 Varies uniformly through each wavelength9. A 型扫描，其反射波的强度将表示为：In immersion testing , the near field effects of a transducer may

8、be eliminated byA. 回波脉冲的宽度Increasing transducer frequencyB. 荧光屏上水平位置Use of a larger diameter transducerC. 信号亮度Using an appropriate water pathD. 信号幅度Use of a focused transducer10. 试验材料中由于缺陷深度的变化引起回波高度的变化，由此所需的补偿称为： A longitudinal ultrasonic wave is transmitted from water into steel at an angle of 5fr

9、om the normal , in such cases , the refracted angle of the transverse wave is:A. 传导Less than the refracted angle of the longitudinal waveB. 衰减Equal to the refraetead angle of the longitudinal waveC. 距离波幅修正Greater than the longitudinal waveD. 解释Not present at all11. 从缺陷中所反射的能量的多少取决于：Where does beam d

10、ivergence occurA. 缺陷尺寸Near fieldB. 缺陷方向Far fieldC. 缺陷类型At the crystalD. 以上全对None of the above12. 斜探头之前应用直探头是为了：Thin sheet may be inspected with the ultrasonic wave directed normal to the surface by observing;A. 为检查例如层状撕裂的面积型缺陷The amplitude of the front surface reflectionB. 为检查 T-接头中未焊透The multiple r

11、eflection patternC. 检查会影响斜探头检查的分层缺陷All front surface reflectionsD. 以上全对None of the above13. 最大的扫查速度主要取决于：Rayleigh waves are influenced most by defects located:A. 晶片频率One wavelength below the surfaceB. 粘滞阻力Six wavelength below the surfaceC. 脉冲重复频率Close to or on the surfaceD. 示波器的余辉 there wavelength b

12、elow the surface14. 板厚 2.5 ”，校对试块厚度应为：Lamb waves can be used to detect:A. 1.5 ”或 t Laminur-type detects near the surface of a thin materialB. 3”或 tC. 5”或 tD. 以上全不对Lack of fusion in the center of a thick weldment15. 下列哪种角质建议用于查板厚小于 0.5 ”的 T-接头焊缝：What law can be used to calculate the angle of refracti

13、on within a metal for both longitudinal and shear waves:A. 45oB. 60oC. 70 oD. 0 oPoissons Ratio LawSnells LawFresnels Field LawCharles Law16. 检测前应做哪项工作(系统定标中) ：During straight beam testing ,test specimens with non-parallel front and back surfaces can cause:A. 扫查范围Partial or total loss of back reflec

14、tionB. 距离波幅曲线No loss in back reflectionC. 传输修正A widened ( broad )back reflection indicationD. 以上全部A focused (narrow) back reflection indication17. 检查一焊缝，发现一条状夹渣，波高为参考线的 75% ，那么此缺陷允许的最长长 度为：In a B-scan display , the length of a screen indication from a discontinuity is related to :A. 0.66B. 0.76C.C. 不做评定None of the above18. 一 2 英寸板厚焊缝，发现一未焊透缺陷，那么这个缺陷应该多长才可接受： 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. 0.66B.B. 2”C. 任何长度都不允许19. 一对接焊缝二侧板厚分别为 1 英寸和 2 英寸，在检验过程中发现一夹渣，其波幅 超过 DAC ，