50 Question MT quiz

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

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

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

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

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

6. 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:

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

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

9. 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:

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

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

12. A coil around the part produces:

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

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

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

16. 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:

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

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

19. Residual magnetism may be beneficial as an aid:

20. 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:

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

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

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

24. 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:

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

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

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

28. 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:

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

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

32. Residual magnetic fields may be used when:

33. Permeability is defined by the formula:

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

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

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

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

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

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

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

41. 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?

42. 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?

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

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

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

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

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

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

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

50. 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:

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