50 Question MT quiz

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

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

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

4. 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:

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

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

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

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

10. 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:

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

12. 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:

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

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

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

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

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

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

19. 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:

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

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

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

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

24. Residual magnetism may be beneficial as an aid:

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

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

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

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

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

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

31. 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?

32. 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:

33. 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:

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

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

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

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

38. 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?

39. 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:

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

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

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

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

44. Permeability is defined by the formula:

45. 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?

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

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

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

49. A coil around the part produces:

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


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