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

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

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

6. An electromagnetic yoke produces:

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

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

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

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

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

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

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

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

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

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

17. 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:

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

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

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

21. 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:

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

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

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

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

26. Permeability is defined by the formula:

27. 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:

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

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

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

31. 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:

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

33. 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?

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

35. 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:

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

37. 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?

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

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

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

41. 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:

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

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

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

45. Residual magnetic fields may be used when:

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

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

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

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

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

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