50 Question MT quiz

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

2. Residual magnetism may be beneficial as an aid:

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

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

5. Residual magnetic fields may be used when:

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

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

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

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

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

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

12. 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?

13. 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:

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

15. 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:

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

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

18. 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?

19. 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:

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

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

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

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

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

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

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

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

28. 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?

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

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

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

32. Permeability is defined by the formula:

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

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

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

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

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

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

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

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

41. 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:

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

43. The pattern of iron powder sprinkled on a paper placed over a bar magnet is called a:

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

45. A coil around the part produces:

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

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

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

49. An electromagnetic yoke produces:

50. 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:

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