50 Question MT quiz

1. 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?

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

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

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

5. 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:

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

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

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

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

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

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

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

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

14. 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:

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

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

17. 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:

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

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

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

21. 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:

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

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

24. 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:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

48. 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:

49. Residual magnetic fields may be used when:

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


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