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

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

4. A coil around the part produces:

5. 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:

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

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

8. 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:

9. 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:

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

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

12. 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:

13. Residual magnetism may be beneficial as an aid:

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

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

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

17. 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?

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

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

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

21. Permeability is defined by the formula:

22. 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:

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

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

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

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

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

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

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

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

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

32. 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:

33. 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:

34. 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?

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

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

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

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

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

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

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

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

43. An electromagnetic yoke produces:

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

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

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

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

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

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

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


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