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. 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:

3. 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:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

19. 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?

20. 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:

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

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

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

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

25. 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:

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

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

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

29. 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?

30. 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:

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

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

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

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

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

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

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

38. 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:

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

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

41. Residual magnetism may be beneficial as an aid:

42. Residual magnetic fields may be used when:

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

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

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

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

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

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

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

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

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