50 Question MT quiz

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

2. Residual magnetism may be beneficial as an aid:

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

4. 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:

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

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

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

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

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

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

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

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

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

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

15. 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:

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

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

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

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

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

21. A coil around the part produces:

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

23. 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?

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

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

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

27. 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:

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

29. 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?

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

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

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

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

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

35. 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?

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

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

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

39. Permeability is defined by the formula:

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

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

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

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

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

45. An electromagnetic yoke produces:

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

47. 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:

48. Residual magnetic fields may be used when:

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

50. 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:


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