50 Question MT quiz

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

2. 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:

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

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

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

6. 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:

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

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

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

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

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

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

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

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

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

16. 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:

17. 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?

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

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

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

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

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

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

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

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

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

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

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

29. A coil around the part produces:

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

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

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

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

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

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

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

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

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

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

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

41. 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?

42. An electromagnetic yoke produces:

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

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

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

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

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

48. 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:

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

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

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