50 Question MT quiz

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

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

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

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

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

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

7. 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?

8. Permeability is defined by the formula:

9. An electromagnetic yoke produces:

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

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

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

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

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

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

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

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

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

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

21. 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?

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

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

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

25. 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:

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

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

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

29. Residual magnetic fields may be used when:

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

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

32. 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:

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

34. Residual magnetism may be beneficial as an aid:

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

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

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

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

39. 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:

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

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

42. 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:

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

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

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

46. A coil around the part produces:

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

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

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

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


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