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

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

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

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

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

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

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

9. 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:

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

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

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

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

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

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

16. 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?

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

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

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

20. Permeability is defined by the formula:

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

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

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

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

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

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

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

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

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

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

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

32. 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:

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

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

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

36. 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:

37. Residual magnetism may be beneficial as an aid:

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

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

40. 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?

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

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

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

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

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

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

47. An electromagnetic yoke produces:

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

49. 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?

50. Residual magnetic fields may be used when:


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