50 Question MT quiz

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

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

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

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

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

6. 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:

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

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

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

10. 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:

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

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

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

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

15. 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:

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

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

18. 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:

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

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

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

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

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

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

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

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

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

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

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

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

31. In magnetic particle inspection, it is best to:

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

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

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

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

36. The general term used to refer to a break in the metallic continuity of the part being tested 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. Retentivity refers to a materials ability to retain a certain amount:

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

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

41. Residual magnetic fields may be used when:

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

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

44. 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?

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

46. 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:

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

48. Residual magnetism may be beneficial as an aid:

49. 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:

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


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