50 Question MT quiz

1. 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?

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

3. 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?

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

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

6. Permeability is defined by the formula:

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

8. 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?

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

10. An electromagnetic yoke produces:

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

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

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

14. 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:

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

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

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

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

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

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

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

22. 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:

23. 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:

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

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

26. 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:

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

28. Residual magnetism may be beneficial as an aid:

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

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

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

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

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

34. 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:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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