50 Question MT quiz

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

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

3. 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?

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

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

6. Permeability is defined by the formula:

7. A coil around the part produces:

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

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

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

11. Residual magnetism may be beneficial as an aid:

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

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

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

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

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

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

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

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

20. An electromagnetic yoke produces:

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

22. Residual magnetic fields may be used when:

23. 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?

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

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

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

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

28. 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?

29. 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:

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

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

32. 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:

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

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

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

36. 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:

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

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

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

40. 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:

41. 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:

42. 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:

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

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

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

46. 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:

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

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

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

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

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