ASNT NDT Level II Practice Questions - ASNT NDT Level II Exam

Why are two magnetization directions commonly required in magnetic particle testing?

Because a single field direction may miss discontinuities that run nearly parallel to that field Because two directions are needed to make visible particles fluorescent Because the first shot only cleans the surface and the second does the inspection Because residual magnetism cannot form after only one shot

Correct Answer:

Because a single field direction may miss discontinuities that run nearly parallel to that field

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