50 Question MT quiz

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

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

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

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

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

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

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

8. The end of a magnet at which the lines of flux are thought of as entering the bar 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. An electromagnetic yoke produces:

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

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

13. 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:

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

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

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

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

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

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

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

21. 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:

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

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

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

25. 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?

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

27. What is the minimum temperature a steel containing 0.8%C has to be heated to before quench cracking can occur?

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

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

30. 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:

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

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

33. Residual magnetism may be beneficial as an aid:

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

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

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

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

38. 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:

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

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

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

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

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

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

45. A coil around the part produces:

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

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

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

49. 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:

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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