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A ball mill uses _____

(a) Impact

(b) Attrition

(c) Impact & Attrition

(d) None of the mentioned

I got this question in class test.

This interesting question is from Unit Operations topic in section Sedimentation and Centrifuge, Mixing, Size Reduction and Separation and Material Handling and Transportation of Food Engineering

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Best answer
The correct choice is (c) Impact & Attrition

Explanation: A ball mill uses both impacts when the solids fall from the top to the bottom and attrition when the particles rub against each other and reduce in size.

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