50 Question MT quiz

1. 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?

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

3. 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?

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

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

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

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

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

9. 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?

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

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

12. A coil around the part produces:

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

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

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

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

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

18. Permeability is defined by the formula:

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

20. 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:

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

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

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

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

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

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

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

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

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

30. An electromagnetic yoke produces:

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

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

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

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

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

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

37. The parts are blanks cut from rolled iron bar stock. They have been rough machined. Inspection by the continuous method, using a circular short, reveals well-defined but broken lines running parallel with the axis on some of the pieces and non indication on others. The broken lines range in length from 6mm to 25mm. These indications are indicative of:

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

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

40. Residual magnetic fields may be used when:

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

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

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

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

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

46. 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:

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

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

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

50. 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:

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