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What is the size range of dry particle powder?

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in Casting-Forming-Welding II by (119k points)
What is the size range of dry particle powder?

(a) 5 to 170 micrometers

(b) 15 to 185 micrometers

(c) 45 to 215 micrometers

(d) 65 to 250 micrometers

The question was posed to me in exam.

This interesting question is from Magnaflux Test topic in portion Non Destructive Techniques of Casting-Forming-Welding II

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Right option is (a) 5 to 170 micrometers

The best I can explain: Dry particle powder is basically applied in the form of a spray or a cloud. This powder is designed to be seen in white light. The particle size of dry particle powder is 5 to 170 micrometers.

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