50 Question MT quiz

1. 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:

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

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

4. A coil around the part produces:

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

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

7. 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:

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

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

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

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

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

13. 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:

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

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

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

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

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

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

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

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

22. 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?

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

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

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

26. Permeability is defined by the formula:

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

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

29. Residual magnetic fields may be used when:

30. 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?

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

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

33. A rough forging discontinuity has following characteristics: it occurs on the surface or internally; it is associated with processing at too low a temperature; it is often caused by excessive working; and it creates irregular cavities varying in size. How would it be identified or classified?

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

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

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

38. An electromagnetic yoke produces:

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

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

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

42. 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:

43. 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:

44. Residual magnetism may be beneficial as an aid:

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

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

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

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

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

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

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