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

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

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

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

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

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

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

9. 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:

10. Residual magnetic fields may be used when:

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

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

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

15. A coil around the part produces:

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

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

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

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

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

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

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

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

24. Permeability is defined by the formula:

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

26. 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?

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

28. 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:

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

30. An electromagnetic yoke produces:

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

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

33. 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:

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

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

36. 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:

37. 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:

38. 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:

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

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

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

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

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

44. Residual magnetism may be beneficial as an aid:

45. 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:

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

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

48. 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?

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

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


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