50 Question MT quiz

1. When using the wet method, why should a high velocity flow of wet method bath over surfaces following removal of the magnetizing current not be used?

2. A rough forging discontinuity has following characteristics: it occurs on the surface or internally; it is associated with processing at too low a temperature; it is often caused by excessive working; and it creates irregular cavities varying in size. How would it be identified or classified?

3. When adding concentrate to any wet magnetic particle suspension liquid it is common practice:

4. Which of the following is not a discontinuity common to rolled products?

5. Where particles are attracted to a site on the surface of a party by a magnetic leakage field which is due to a condition such as a crack, lap, or other condition not acceptable to the applicable standards for the part, then we have:

6. A circular field may be included by which of the following methods?

7. Which of the following materials would be UNSUITABLE for magnetic particle inspection?

8. When testing for fine surface cracks, the preferred MT method should be:

9. Materials which are weakly attracted magnetically are classified as:

10. Retentivity refers to a materials ability to retain a certain amount:

11. What is the minimum temperature a steel containing 0.8%C has to be heated to before quench cracking can occur?

12. The term used to refer to the total opposition to flow of current represented by the combined effect of resistance, inductance and capacitance of a circuit is:

13. A specimen may be demagnetized by which of the following methods?

14. An electromagnetic yoke produces:

15. A prime consideration when selecting a powder to be used as a magnetic particle medium is to select a powder that:

16. Direct current, or three-phase full wave rectified current magnetisation are the most suitable wave forms to use:-

17. Which of the following discontinuity may be found by magnetic particle inspection in a welded component made from rolled steel plate?

18. External poles which are too strong to permit good inspection of a part are more likely to result when using:

19. The parts are blanks cut from rolled iron bar stock. They have been rough machined. Inspection by the continuous method, using a circular short, reveals well-defined but broken lines running parallel with the axis on some of the pieces and non indication on others. The broken lines range in length from 6mm to 25mm. These indications are indicative of:

20. The length of a part being magnetised by passing an electric current from one end to the other:

21. To detect lengthwise defects on the inside diameter of hollow parts, you should:

22. A rough forging that has received no further processing is MT tested. A very sharp indication is observed to run every direction, extending deeply into the part and perpendicular to the surface. What is the identity of the indication?

23. Since the magnetic lines of force within a bar magnet run the length of the bar, it is said to be:

24. The end of a magnet at which the lines of flux are thought of as entering the bar is:

25. The general term used to refer to a break in the metallic continuity of the part being tested is:

26. A gear with case-hardened ground teeth and hub ends is MT tested. Indications are detected on five of the teeth. Although the indications are very sharp and distinct, they do not break over the edges of the parts. What is the probable identity of the indication?

27. What type of magnetisation used the formula: Ampere-turns=45,000(L/D)?

28. What wattage is most commonly used for mercury vapour bulbs for portable fluorescent magnetic particle inspection?

29. If an overall pattern (sometimes circular lines) appear on the test surfaces, how should the inspector reprocess the test piece?

30. A desirable property of magnetic particles used for the inspection medium for either the dry or wet method is that they:

31. If 25mm and 50mm diameter bars were magnetised by passing the same current through them, the magnetic fields would be:

32. Permeability is defined by the formula:

33. Which of the following casting defects is caused by non-uniform cooling resulting in stresses which rupture the surface of the metal?

34. The most effective MT method for inspection of a large casting is using:

35. Which type of black light source is most suitable for inspection when fluorescent magnetic particle inspection is to be carried out?

36. Why are large soft contact areas such as lead or copper braid used for surfaces or headstocks?

37. If a current of the same amperage is passed through two conductors of the same dimensions, one of which is magnetic and one of which is non-magnetic, the magnetic field surrounding the conductors will:

38. What equipment is used to determine if a part has been demagnetized?

39. The strongest magnetic field in a coil is at the:

40. An interruption in the normal physical structure or configuration of a part which produces an MT indication is called:

41. If a copper conductor is placed through a ferrous cylinder and a current is passed through the conductor, then the magnetic field (flux density) in the cylinder will be:

42. Why is it preferable to disassembly parts before magnetic particle inspection?

43. The lines of force that form a path round a crack in a ring magnet are called:

44. Internal splines and holes drilled parallel to and near test surfaces will cause:

45. Which of the following is not an acceptable technique for removing a thin film of oil or grease prior to magnetic particle testing?

46. The most common failure mechanism associated with sharp fillets, notches, undercuts and seams is:

47. In order to detect defects in different directions in a material by magnetic particle inspection, it is best to use:

48. A limitation of low fill factor coil magnetisation techniques is that:

49. When the most complete demagnetisation available is desired and demagnetisation is to be accomplished by placing the part in a coil energised with AC of progressively decreasing amperage, the following orientation of the long axis of the part is most desirable:

50. In longitudinal magnetization the proper term for calculating magnetizating force is:

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