50 Question MT quiz

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

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

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

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

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

6. When testing a bar with an L/D ratio of four in a ten-turn coil, the required current would be:

7. A coil around the part produces:

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

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

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

11. 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?

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

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

14. 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:

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

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

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

18. 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:

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

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

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

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

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

24. 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:

25. Residual magnetism may be beneficial as an aid:

26. The accumulation of particles at a site on the parts surface, collected at and held to the site by the magnetic leakage field, is called:

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

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

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

30. 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?

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

32. Residual magnetic fields may be used when:

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

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

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

36. Permeability is defined by the formula:

37. Which of these cracks may appear as an irregular, checked, or scattered pattern of fine lines usually caused by local overheating?

38. 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:

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

40. If wet magnetic particle suspension is not uniform, then:

41. Of the following discontinuity categories, which one is considered most detrimental to the service life of an item?

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

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

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

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

46. Comparing parts that have been circularly magnetised and those which have been longitudinally magnetised, which retains the most objectionable residual field if not demagnetised?

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

48. 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:

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

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


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