50 Question MT quiz

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

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

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

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

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

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

7. 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:

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

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

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

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

12. An electromagnetic yoke produces:

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

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

15. 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:

16. Residual magnetism may be beneficial as an aid:

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

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

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

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

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

22. 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?

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

24. 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:

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

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

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

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

29. 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?

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

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

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

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

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

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

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

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

38. Permeability is defined by the formula:

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

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

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

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

43. Residual magnetic fields may be used when:

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

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

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

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

48. 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?

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

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

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