50 Question MT quiz

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

2. An electromagnetic yoke produces:

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

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

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

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

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

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

9. 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:

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

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

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

13. 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?

14. 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:

15. Residual magnetism may be beneficial as an aid:

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

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

18. 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:

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

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

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

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

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

24. 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?

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

26. 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:

27. 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?

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

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

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

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

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

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

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

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

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

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

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

39. 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:

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

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

42. 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?

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

44. 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:

45. Permeability is defined by the formula:

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

47. Residual magnetic fields may be used when:

48. A coil around the part produces:

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

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


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