50 Question MT quiz

1. 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:

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

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. 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:

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

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

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

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

9. Permeability is defined by the formula:

10. 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:

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

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

13. A limitation of low fill factor coil magnetisation techniques is that:

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

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

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

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

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

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

20. 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:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

37. 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:

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

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

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

41. 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:

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

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

44. 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?

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

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

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

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

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

50. Residual magnetism may be beneficial as an aid:


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