MT_Level_II.docx - Magnetic Particle Level II 1 The...

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Magnetic Particle Level II 1. The interpretation of magnetic particle indications may be aided by: A. Observing with a magnifying glass B. Observing the indications as they are formed C. Reproducing the indication residually D. All of the above 2. Residual magnetism may be beneficial as an aid: 3. An interruption in the normal physical structure or configuration of a part which produces an MT indication is called: 4. Comparing parts that have been circularly magnetized and those that have been longitudinally magnetized, which retains the most objectionable residual field if not demagnetized? 5. What type of magnetization uses the formula Apere-turn = 45,000/LD? A. Circular B. Longitudinal C. Parallel D. Vectored 6. Why are large soft contact areas such as lead or copper braid used for surfaces or headstocks? 7. A rough forging that has received no further processing is magnetic particle tested. An indication is observed to run in every direction. It appears to extend deeply into the part and run perpendicular to the surface. It is very sharp. What is the probable identity of the indication?
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8. A gear with case-hardened ground teeth and hub ends is MT tested. Individual indications are detected on five of the teeth and on the one end surface of the hub. Although the indications are very sharp and distinct, they do not break over the edges of the part. What is the probable identity of the indication? 9. If an overall pattern (sometimes circular lines) appears on the test surfaces, how should the inspector reprocess the test piece? A. Retest at a higher amperage B. Demagnetize C. Retest at lower amperage D. Both A and B 10. A prime consideration when selecting a power to be used as a magnetic particle medium is to select a powder that:
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  • Spring '19
  • kj
  • Magnetism, Magnetic Field, B. Demagnetize

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