50 Question MT quiz

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

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

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

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

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

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

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

8. 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:

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

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

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

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

13. Permeability is defined by the formula:

14. Residual magnetic fields may be used when:

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

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. 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:

18. 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:

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

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

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

22. Residual magnetism may be beneficial as an aid:

23. Half wave rectified AC (HWDC) is the best current to use for detection of:

24. A coil around the part produces:

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

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

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

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

29. 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?

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

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

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

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

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

35. 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:

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

37. 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?

38. 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:

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

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

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

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

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

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

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

46. An electromagnetic yoke produces:

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

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

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

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


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