254. ( A ) The degree of sensitivity of the magnetic particle method of inspection decreases： (磁粉检测灵敏度减少：)
a. With a decrease in size of the discontinuity and also with an increase in depth below the surface (不连续尺寸减小和距表面深度增加)
b. In defects which are in lengthy cracklike forms (缺陷有长的裂纹型态)
c. When defects are perpendicular to the lines of force (当缺陷垂直于磁力线时) d. All of the above (以上都对)
255. ( D ) Which magnetic particle inspection method applies the medium to the surface of the work while the magnetic current is flowing ? (何种磁粉检验方法当磁力线流动时要加媒质在工作 表面上？
a. Dry method (干法)
b. Residual method (剩磁法) c. Wet method (湿法)
d. Continuous method (连续磁化法)
256. ( C ) Subsurface discontinuity indication produce powder patterns with：(近表面不连续使磁 粉呈现)
a. A sharply defined appearance (清晰显示)
b. MT cannot locate sub-surface discontinuities (磁粉检测不能检出近表面缺陷) c. A fuzzy appearance (模糊显示)
d. A straight, sharp, fine and often intermittent appearance (正气的，清晰的，纤细的，经常 是间断的显示)
257. ( D ) The magnetic particle method of inspection is applicable to：(磁粉检验用于：) a. Non ferrous materials (非铁基材料) b. Austenitic steels (奥氏体钢)
c. Braze-welded joints (黄铜焊接接头)
d. Ferromagneic materials in which the deposited weld matal is also ferromagnetic (铁磁材料 其上的焊缝也是铁磁材料)
258. ( A ) Decibel is a term associated with which NDT method ? (术语分贝与何种无损检测方法 相关联) a. UT b. RT c. MT d. PT e. ET
259. ( B ) Which of the following is truly a volumetric test method ? (以下何种是体积检验方 法？) a. RT b. UT c. ET d. MT
e. None of the above（以上都不对）
41
260. ( D ) For the butt joint at right, 1 indicates the： (下面对接接头中，1 表示) a. Shoulder (肩)
b. Included angle (坡口角度) c. Throat (焊喉)
d. Root opening (根部间隙)
e. None of the above (以上都不对)
261. ( B ) In reference to the above drawing, letter “A” represents which of the following defects ? (下图中字母“A”表示何种缺陷？) a. Toe crack (焊趾裂纹) b. Crater crack (弧坑裂纹)
c. Underbead crack (焊道下裂纹) d. Throat crack (焊喉裂纹)
e. Heat affected zone crack (热影响区裂纹)
262. ( E ) In reference to the above drawing, letter “ B” represents which of the following defects ? (上图中字母“B”表示何种缺陷？) a. Crater crack (弧坑裂纹) b. Transverse crack (横向裂纹) c. Toe crack (焊趾裂纹) d. Lamellar tear (层状撕裂)
e. Longitudinal crack (纵向裂纹)
42
263. ( D ) In reference to the above drawing, letter “C” represents which of the following defects ? (上图中字母“C”表示何种缺陷？) a. Underbead crack (焊道下裂纹) b. Delamination (分层) c. Tce crack (焊趾裂纹)
d. None of the above (以上都不对)
264. ( E ) In reference to the above drawings, the letter “D” refers to which of the following weld preparations：(参照上图，字母“D”表示：) a. Groove face (坡口面) b. Root face (钝边)
c. Groove angle (坡口角度) d. Plate thickness (板厚) e. Root opening (根部间隙)
265. ( D ) In reference to the above drawings, the letter “C” refers to which of the following weld preparations：(参照上图，字母“C”表示：) a. Bevel angle (坡口角度) b. Root face (坡口面)
c. Root opening (根部间隙) d. Groove radius (坡口半径) e. Throat (焊喉)
266. ( C ) In reference to the above drawings, the letter “A” refers to which of the following weld preparations：(参照上图，字母“A”表示：) a. Root opening (根部间隙) b. Bevel angle (斜面角度) c. Groove angel (坡口角度) d. Root face (钝边) e. Weld size (焊缝尺寸)
267. ( A ) In reference to the above drawings, the letter “B” refers to which of the following weld
43
preparations：(参照上图，字母“B”表示：) a. Bevel angle (斜面角度) b. Root opening (根部间隙) c. Groove angle (坡口角度) d. Plate thickness (板厚) e. Groove radius (坡口半径)
268. ( D ) In reference to the above desired weld, what is the correct weld symbol for this joint ? (哪 个焊缝符号能正确表示下图的焊缝) a. b. c. d.
269. ( B ) With reference to the above desired weld, which correct weld symbol represents this joint ? (哪个焊缝符号能正确表示上图的焊缝) a. b. c.
270. ( C ) The weld gage on the right is measuring the：下图焊规正在测量：) a. excessive undercut (超标咬边) b. underfill (未焊满)
c. excessive convexity (超高) d. overlap (焊瘤)
e. acceptable buildup (合格的堆焊焊缝)
44
271. ( D ) When welds need repair, to whom should you make the report ? (焊缝需要返修时，你应 向谁报告？)
a. To the welder whose mark is on the weld (焊缝上所打焊工识别号的焊工) b. To another welder, better trained (另一名培训更好的焊工) c. To the secretary (秘书)
d. To the project engineer (项目工程师)
272. ( E ) Match the letter “D” with the correct weld groove detail. (下图中字母“D”相对应的焊缝是：) a. Single U groove weld (单面U 坡口焊缝) b. Double bevel groove weld (双面坡口焊缝) c. Single J groove weld (单面J 坡口焊缝) d. Single V groove weld (单面V 坡口焊缝) e. None of the above (以上都不对)
273. ( B ) Match the letter “G” with the correct weld groove detail. (以上图中字母“G”相对应的焊缝是：) a. double V groove weld (双面V 型坡口焊缝) b. double U groove weld (双面U 型坡口焊缝) c. single U groove weld (单面U 型型坡口焊缝)
45