50 Question MT quiz

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

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

3. 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?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

22. Why are large soft contact areas such as lead or copper braid used for surfaces or headstocks?

23. Residual magnetic fields may be used when:

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

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

26. Permeability is defined by the formula:

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

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

29. A coil around the part produces:

30. 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:

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

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

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

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

35. 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:

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

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

38. 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:

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

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

41. 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:

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

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

44. 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?

45. 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:

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

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

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

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

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


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