50 Question MT quiz

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

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

3. 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:

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

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

6. Permeability is defined by the formula:

7. 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?

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

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

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

11. 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:

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

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

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

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

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

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

18. 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:

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

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

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

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

23. 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:

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

25. An electromagnetic yoke produces:

26. 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?

27. 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?

28. Residual magnetic fields may be used when:

29. Residual magnetism may be beneficial as an aid:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

49. 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:

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


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