50 Question MT quiz

1. 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?

2. 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:

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

4. An electromagnetic yoke produces:

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

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

7. 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:

8. 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?

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

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

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

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

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

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

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

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

17. Permeability is defined by the formula:

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

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

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

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

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

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

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

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

26. 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:

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

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

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

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

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

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

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

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

35. Residual magnetism may be beneficial as an aid:

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

37. A coil around the part produces:

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

39. What wattage is most commonly used for mercury vapour bulbs for portable fluorescent 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. 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?

42. 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:

43. 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:

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

45. Residual magnetic fields may be used when:

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

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

48. 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:

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

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


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