50 Question MT quiz

1. The magnetic particle test technique in which the indicating medium is applied after ceasing application of the magnetising force is called the:-

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

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

4. Residual magnetism may be beneficial as an aid:

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

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

7. 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:

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

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

10. 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:

11. 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:

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

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

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

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

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

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

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

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

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

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

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

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

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

25. 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:

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

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

28. 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?

29. 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:

30. The parts are blanks cut from rolled iron bar stock. They have been rough machined. Inspection by the continuous method, using a circular short, reveals well-defined but broken lines running parallel with the axis on some of the pieces and non indication on others. The broken lines range in length from 6mm to 25mm. These indications are indicative of:

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

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

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

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

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

36. 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:

37. If wet magnetic particle suspension is not uniform, then:

38. 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?

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

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

41. An electromagnetic yoke produces:

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

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

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

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

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

47. Residual magnetic fields may be used when:

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

49. 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:

50. 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?

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