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Magnetic particles with fluorescent coating are seen under which light?

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in Casting-Forming-Welding II by (119k points)
Magnetic particles with fluorescent coating are seen under which light?

(a) White light

(b) Infrared light

(c) Black light

(d) Ultraviolet light

I got this question during a job interview.

My question is based upon Magnaflux Test in chapter Non Destructive Techniques of Casting-Forming-Welding II

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The correct answer is (d) Ultraviolet light

The explanation is: In magnetic particle testing, only ferrous materials can be tested using a magnetic particle test. The casting which is undergoing magnetic inspection, if it is coated with fluorescence, then it has to be viewed in an ultraviolet light only.

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