50 Question MT quiz

1. 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:

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

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

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

5. An electromagnetic yoke produces:

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

7. A coil around the part produces:

8. 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:

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

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

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

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

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

15. A break in the magnetic uniformity of a part that is called a magnetic discontinuity is related to a sudden change in:

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

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

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

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

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

21. 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:

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

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

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

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

26. 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?

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

28. Permeability is defined by the formula:

29. 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?

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

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

32. 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:

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

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

35. 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:

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

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

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

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

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

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

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

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

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

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

46. Residual magnetism may be beneficial as an aid:

47. 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:

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

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

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


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