50 Question MT quiz

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

2. 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:

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

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

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

6. 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:

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

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

9. 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:

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

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

12. 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?

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

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

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

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

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

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

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

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

21. 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:

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

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

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

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

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

27. Residual magnetic fields may be used when:

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

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

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

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

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

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

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

35. A coil around the part produces:

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

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

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

39. What wattage is most commonly used for mercury vapour bulbs for portable fluorescent magnetic particle inspection?

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

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

42. 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:

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

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

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

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

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

48. Permeability is defined by the formula:

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

50. 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:

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