50 Question MT quiz

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

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

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

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

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

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

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

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

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

10. A coil around the part produces:

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

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

13. 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:

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

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

16. 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:

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

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

19. Permeability is defined by the formula:

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

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

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

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

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

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

26. 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?

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

28. 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?

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

30. 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:

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

32. An electromagnetic yoke produces:

33. The strongest magnetic field in a coil is at the:

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

35. 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:

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

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

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

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

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

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

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

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

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

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

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

47. 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:

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

49. Which type of black light source is most suitable for inspection when fluorescent magnetic particle inspection is to be carried out?

50. 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?

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