50 Question MT quiz

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

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

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

4. 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:

5. 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?

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

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

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

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. Materials which are weakly attracted magnetically are classified as:

11. 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:

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

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

14. 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?

15. Residual magnetism may be beneficial as an aid:

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

17. 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:

18. 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:

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

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

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

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

23. Permeability is defined by the formula:

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

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

28. 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:

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

30. An electromagnetic yoke produces:

31. Residual magnetic fields may be used when:

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

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

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

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

36. 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:

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

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

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

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

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

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

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

44. 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:

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

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

47. 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:

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

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

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


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