50 Question MT quiz

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

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

3. A coil around the part produces:

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

5. 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:

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

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

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

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

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

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

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

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

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

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

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. Materials which are weakly attracted magnetically are classified as:

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

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

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

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

22. 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:

23. Permeability is defined by the formula:

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

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

26. 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:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

46. An electromagnetic yoke produces:

47. 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?

48. 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:

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

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

Login:

Username:
Password:
Not a member? Sign up | Forgot password?

Featured Ads

LIKE US ON FACEBOOK

MOST COMMENTED ON THIS MONTH

  • No Comments

Latest GOOGLE Headlines

LATEST BBC Headlines

LATEST NY Times Headlines

LATEST SMH Headlines

Useful Links