50 Question MT quiz

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

2. 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:

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

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

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

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

7. 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:

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

9. Which type of black light source is most suitable for inspection when fluorescent magnetic particle inspection is to be carried out?

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

11. 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?

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

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

14. 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?

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

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

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

18. 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:

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

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

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

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

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

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

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

26. Residual magnetism may be beneficial as an aid:

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

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

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

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

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

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

33. Permeability is defined by the formula:

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

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

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

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

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

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

40. A coil around the part produces:

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

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

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

44. 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:

45. 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:

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

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

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

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

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

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