50 Question MT quiz

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

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

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

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

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

6. 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?

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

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

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

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

11. 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:

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

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

14. Permeability is defined by the formula:

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

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

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

18. 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?

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

20. 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?

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

22. 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:

23. 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:

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

25. A coil around the part produces:

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

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

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

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

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

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

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

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

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

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

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

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

38. Which of the following is not a discontinuity common to rolled products?

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

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

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

42. Residual magnetism may be beneficial as an aid:

43. An electromagnetic yoke produces:

44. 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:

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

46. 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:

47. Residual magnetic fields may be used when:

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

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

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

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