50 Question MT quiz

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

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

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

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

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

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

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

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

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

10. 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:

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

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

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

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

15. Residual magnetism may be beneficial as an aid:

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

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

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

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

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

21. 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:

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

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

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

25. An electromagnetic yoke produces:

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

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

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

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

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

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

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

33. Permeability is defined by the formula:

34. 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?

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

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

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

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

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

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

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

43. 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:

44. 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:

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

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

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

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

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

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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