50 Question MT quiz

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

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

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

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

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

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

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

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

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

10. 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:

11. 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:

12. 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?

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

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

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

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

17. 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:

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

20. 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:

21. 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:

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

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

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

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

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

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

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

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

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

31. Residual magnetism may be beneficial as an aid:

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

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

34. 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:

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

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

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

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

39. Residual magnetic fields may be used when:

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

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

42. A coil around the part produces:

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

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

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

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

47. 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:

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

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

50. An electromagnetic yoke produces:


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