50 Question MT quiz

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

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

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

4. 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?

5. Cold working indications will not reappear if the part is:

6. The proper number of ampere-turns for a given test specimen is determined by:

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

8. Discontinuities in plate, sheet, or strip caused by pipe, inclusions, or blowholes in the original ingot which after rolling are usually flat and parallel to the outside surface are called:

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

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

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

12. Which of the following is an advantage of the dry method over the wet method?

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

14. Indications at the root of a notch caused by flux leakage resulting from the notch configuration are called:

15. A coil shot is required to be performed after a head shot using the wet continuous method. In order to properly conduct the coil shot it is necessary to:

16. Determine the L/D ratio for a component 15cm long and 2.5cm diameter.

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

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

19. The magnetic particle test technique in which the indicating medium is applied after ceasing application of the magnetising force is called the:-

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

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

22. To detect a lack of root fusion with the magnetic particle method, it must be oriented approximately:-

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

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

25. 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:

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

27. Permeability is defined by the formula:

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

29. 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?

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

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

32. 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:

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

34. Residual magnetism may be beneficial as an aid:

35. The deeper a sub-surface discontinuity lies below the surface:-

36. The interpretation of magnetic particle indications may be aided by:

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

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

39. 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?

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

41. Residual magnetic fields may be used when:

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

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

44. An electromagnetic yoke produces:

45. The ability of matter to attract other matter to itself is a phenomenon associated with:

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

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

48. In magnetic particle inspection, it is best to:

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

50. 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:

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