30 Question MT quiz

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

2. 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:

3. 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:

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

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

6. 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:

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

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

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

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

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

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

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

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

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

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

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

18. Residual magnetism may be beneficial as an aid:

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

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

21. Residual magnetic fields may be used when:

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

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

24. 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?

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

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

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

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

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

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

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