ASME磁粉II级基础理论试卷.pdf

磁粉II级基础理论试卷 磁粉II级基础理论试卷 MT Level II General Examination 姓名： 答卷时间： 地点： Name Time Location 得分： 评卷人： 时间： Marks Examiner Date 1. 每平方厘米一根磁感应线的度量单位为： ( C ) A) 一奥斯特 B) 一欧姆 C) 一高斯 D) 一安培 The unit of measure of one line of flux per square centimeter of area is one: A) Oersted B) Ohm C) Gauss D) Ampere 2. 围绕零件的线圈产生： ( B ) A) 周向磁场 B) 纵向磁场 C) 依电流类型可能为A，也可能为B D) 间隙磁场 A coil around the part produces: A) a circular field B) a longitudinal field C) either A and B depending on the type of current applied D) an intermittent field 3. 能被强烈地吸引到磁铁上的材料叫做： ( C ) A) 被磁化的材料 B) 非磁性材料 C) 铁磁性材料 D) 被极化的材料 Materials which are strongly attracted to a magnet are called: A) magnetized B) nonmagnetic C) ferromagnetic D) polarized 4. 受磁场吸引微弱的材料叫做： ( A ) A) 顺磁性材料 B) 抗磁性材料 C) 铁磁性材料 D) 非磁性材料 Materials which are weakly attracted magnetically are called. A) paramagnetic B) diamagnetic C) ferromagnetic D) nonmagnetic 5. 被磁场排斥的材料叫做： ( B ) A) 顺磁性材料 B) 抗磁性材料 C) 铁磁性材料 D) 非磁性材料 Materials which are repelled magnetically are called. A) paramagnetic B) diamagnetic C) ferromagnetic D) nonmagnetic 6. 磁铁上，磁力线进入的一端叫做： ( B ) A) 北极 B) 南极 C) 北极和南极 D) 以上都不是 The end of a magnet at which the lines of flux are entering is: A) the north pole B) the south pole C) both north and south poles D) none of the above 7. 将铁粉撒在一根磁棒上的纸上，由铁粉形成的图案叫做： ( C ) A) 磁场测量图 B) 磁强计 C) 磁图 D) 磁通计 The pattern of iron powder sprinkled on a paper placed over bar magnet is called: A) field survey B) magnetometer C) magnetograph D) flux meter 8. 在环形磁铁上围绕一个裂纹形成的磁力线叫做： ( B ) A) 磁力线 B) 漏磁通 C) 磁场强度 D) 纵向磁场 The lines of force that form a path around a crack in a ring magnet are called: A) magnetic line of force B) leakage flux C) field strength D) longitudinal field 9. 棒形磁铁内的磁力线沿磁铁的长度方向，这个磁棒的磁化叫做？ ( D ) A) 随机磁化 B) 永久磁化 C) 周向磁化 D) 纵向磁化 Since the magnetic lines of force within a bar magnet run the length of the bar, it is said to be: A) randomly magnetized B) permanently magnetized C) circularly magnetized D) longitudinally magnetized 10. 下列哪种方法可使试样退磁？ ( D ) A) 高于居里温度的热处理 B) 交流线圈 C) 可反向的直流磁场 D) 以上方法均可以 A specimen may be demagnetized by which of the following methods? A) heat treatment above curie temperature B) AC coil C) reversing DC fields D) all of the above 11. 零件中磁性均匀性的间断与什么参数的急剧变化有关？ ( D ) A) 电感 B) 电阻率 C) 电容 D) 磁导率 A break in the magnetic uniformity of a part that is called a magnetic discontinuity is related to a sudden change in? A) inductance B) resistivity C) capacitance D) permeability 12. 直径为1英寸和2英寸的棒材通过相同的电流进行磁化，其表面磁场： ( D ) A) 两根棒的磁场相同 B) 直径为2英寸的棒材磁场较强 C) 直径为1英寸的棒材磁场较弱 D) 直径为1英寸的棒材磁场较强 If one-inch and two-inch diameter bars were magnetized by passing the same current through them, the magnetic fields would be: A) the same for both B) stronger in the two-inch diameter bar C) weaker in the one-inch diameter bar D) stronger in the one-inch diameter bar 13. 同样大小的电流通过两根尺寸相同的导体时，如果一根是磁性的，另一根是非磁性的，则 围绕导体的磁场： ( D ) A) 磁性导体周围的磁场较强 B) 非磁性导体周围的磁场较强 C) 随磁导率变化 D) 两根导体一样 If a current of the same amperage is passed through two conductors with the same dimensions one of which is magnetic and one of which is nonmagnetic, the magnetic field surrounding the conductors will: A) be stringer for the magnetic conductor B) be stronger for the nomagnetic conductor C) vary with the permeability D) be the same for both conductors 14. 下面哪种铸造的缺陷是由于冷却不均匀产生的应力使金属表面断裂而引起的？ ( B ) A) 缩松 B) 热裂 C) 气孔 D) 夹渣 Which of the following casting defects is caused by non-uniform cooling resulting in stresses which rupture the surface of the metal? A) shrink B) hot tears C) porosity D) dross 15. 表示电路中电阻、电压和电容的综合效应对电流总阻力的术语是： ( B ) A) 感抗 B) 阻抗 C) 磁阻 D) 衰减 The term used to refer to the total opposition to flow of currentre presented by the combined effect of resistance, inductance, and capacitance of a circuit is: A) inductive reactance B) impedance C) reluctance D) decay 16. 对一个未经加工的坯件进行磁粉检验时，发现一个向各个方向延伸的显示。显示看起来垂 直于表面，延伸至零件深处，显示非常清晰，该显示可能是哪种缺陷？ ( A ) A) 锻裂 B) 折叠 C) 白点 D) 缝隙 A rough forging that has received no further processing is magnetic particle tested. An indication w w w . b z f x w . c o m is observed to run in every direction. It appears to extend deeply into the part and perpendicular to the surface. It is very sharp. What is the probable identity of the indication? A) forging burst B) lap C) flake D) seam 17. 半波整流交流电用来检测： ( C ) A) 表面缺陷 B) 近表面缺陷 C) 表面和近表面缺陷 D) 以上都不是 Half wave rectified AC(HWDC) is used for detection of: A) surface defects only B) subsurface defects only C) surface and subsurface defects D) none of the above 18. 下面哪种缺陷不是滚轧产品中常见的缺陷： ( C ) A) 缝隙 B) 分层 C) 冷隔 D) 裂纹 Which one of the following is not a discontinuity common to rolled products? A) Seams B) Laminations C) Cold shuts D) Cracks 19. 下面哪种缺陷不是锻造产品中常见的缺陷？ ( B ) A) 折叠 B) 缩孔 C) 裂纹 D) 白点 Which one of the following is not a discontinuity common to forged products A) laps B) shrinkage C) bursts D) flakes 20. 下列缺陷中，哪种缺陷被认为是对零件使用寿命最有害的？ ( C ) A) 近表面夹杂 B) 近表面气孔和孔穴 C) 露出表面的裂纹 D) 以上都是 Of the following discontinuity categories, which one is considered most detrimental to the service life of an item? A) subsurface inclusions B) subsurface porosity and voids C) cracks open to the surface D) all of the above 21. 电流从正到负流过线圈时， 建立一个纵向磁场， 下面哪种法则可用来确定磁场的方向？( B ) A) 左手定则 B) 右手定则 C) 欧姆定律 D) 没有相关的定律 With current flowing from + to - in a coil, a longitudinal field is created. Which of the following may be used to establish the direction of the magnetic field? A) left hand rule B) right hand rule C) ohms law D) there is no relevant law 22. 电流通过导体时，围绕导体的是： ( C ) A) 涡流场 B) 电流 C) 磁场 D) 剩磁场 If a current is passed through an electrical conductor, what will surround the conductor? A) eddy current field B) current C) magnetic field D) residual field 23. 从零件一端到另一端通电磁化零件时，零件的长度： ( C ) A) 影响零件的磁导率 B) 改变磁场的强度 C) 对磁场强度无影响 D) 使磁场发生变化 The length of a part being magnetized by passing an electric current from one end to the other: A) affects the permeability of the part B) changes the strength of the magnetic field C) does not affect the strength of the magnetic field D) causes the magnetic field to vary 24. 用来表示被检零件金属的连续性间断的通用术语是： ( A ) A) 不连续性 B) 裂纹 C) 缝隙 D) 折叠 The general term used to a break in the metallic continuity of the part being tested is: A) discontinuity B) crack C) seam D) lap 25. 顺磁性材料的磁特性是： ( C ) w w w . b z f x w . c o m A) 磁性强 B) 根本无磁性 C) 磁性微弱 D) 缺乏电子运动 What magnetic property does a paramagnetic material possess? A) highly magnetic B) no magnetic property at all C) slightly magnetic D) a demonstrated lack of electron mobility 26.下面哪种方法常用来保存磁粉显示图形？ ( D ) A) 透明漆 B) 透明胶带 C) 照相 D) 以上都是 Which of the following is a commonly used technique for preserving MT powder patterns? A) clear lacquer B) transparent tape C) photography D) all of the above 27. 撤去磁场后，保留在可磁化的材料中的磁性叫做： ( B ) A) 漂移场 B) 剩余磁场 C) 衰减磁场 D) 永久磁场 The magnetism which remains in a piece of magnetizable material after the magnetizing force has been removed is called the: A) tramp field B) residual field C) damped field D) permanent field 28. 进一步增大磁化力，材料中的磁性不会再增大的点叫做： ( B ) A) 显点 B) 饱和点 C) 剩磁点 D) 残留点 The point at which the magnetism in a material can not be increased even though the magnetizing force continues to increase is known as the: A) salient pole B) sataration point C) residual point D) remnant point 29. 哪种类型的电流具有“趋肤效应” ( A ) A) 交流 B) 直流 C) 半波整流 D) 全波整流 Which type of current has a “skin effect“? A) AC B) DC C) half wave rectified D) full wave rectified 30. 经过周向磁化的零件与经过纵向磁化的零件相比，在不退磁的情况下，哪种零件保留的残 余磁场最有害？ ( A ) A) 纵向磁化的零件 B) 周向磁化的零件 C) 矢量磁化的零件 D) 剩余磁化的零件 Comparing parts that have been circularly magnetized and those which have been longitudinally magnetized, which retains the most objectionable residual field if not demagnetized? A) longitudinal B) circular C) vectored D) remnant 31. 哪种类型的磁化使用公式：安匝数 D/L 45000 ( B ) A) 周向磁化 B) 纵向磁化 C) 平行磁化 D) 矢量磁化 What type of magnetization used the formula: Ampere-turns=45,000/L/D A) circular B) longitudinal C) parallel D) vectored 32. 零件表面通电或用夹头通电时，为什么要使用大的软接触面如铅或铜网？ ( A ) A) 为增大接触面积，减少烧伤零件的可能性 B) 因为它们的熔点低 C) 因为它们有助于加热金属，从而有利于磁感应 D) 为了增大接触面积和磁通密度 Why are large soft contact areas such as lead or copper braid used for surfaces or head strocks? A) to increase the contact area and reduce the possibility of burning B) because of their low melting points C) because they help heat metal, thus facilitating magnetic induction D) to increase the contact area and flax density 33. 选择磁粉检验用的磁粉时，对磁粉的主要要求是： ( A ) A) 与被检表面形成高对比度 B) 与被检表面形成低对比度 w w w . b z f x w . c o m C) 能粘附到被检表面上 D) 需要高的退磁电流才能去除它 A prime consideration when selecting a powder to be used as a magnetic particle medium is to select a powder that: A) provides a high contrast to the surface being tested B) provides a low contrast to the surface being tested C) will adhere to the surface being tested D) requires a high demagnetization current to remove it 34. 在10匝线圈中对L/D为4的棒材进行试验时，需要的电流值为： ( D ) A) 45000安培 B) 不知道，需要更多的数据才能算出 C) 18000安培 D) 1125安培 When testing a bar with an L/D ratio of four in a ten-turn coil, the required current would be: A) 45,000 amperes B) unknown, more information is needed C) 18,000 amperes D) 1125 amperes 35. 线圈磁化的一些限制是： ( D ) A) 线圈相对于零件的直径应尽可能小 B) 有效磁场一般限于线圈的内壁附近 C) 小直径零件应靠近线圈放置 D) 以上都是 Some limitations of coil magnetization techniques are that: A) coil must be of minimum diameter in relation to part B) the effective field is generally limited on either side of the coil C) small diameter parts should be placed close to the coil D) all of the above 36. 材料磁导率用来描述： ( A ) A) 材料被磁化的难易程度 B) 零件中磁场的程度 C) 零件退磁需要的时间长短 D) 保留磁场的能力 The permeability of a material describes: A) the ease with it can be magnetized B) the depth of the magnetic field in the part C) the length of time require to demagnetize D) the ability to retain the magnetic field 37. 用来确定磁粉检验中表面缺陷的可检出能力的一般法则是： ( B ) A) 缺陷深度和宽度之间无联系 B) 缺陷深度至少为缺陷在表面上开口宽度的5倍 C) 缺陷深度与宽度之比为1 D) 以上都不是 A general rule to use for determining the defectability of surface discontinuities by magnetic particle inspection is that: A) the depth and width have no bearing to each other B) the depth should be at least five times the width of the opening of the defect at the surface C) the depth s