Agricultural Engineering > GATE 2021 > Size Reduction
A ball mill of 200 cm diameter grinds solid materials while operating with 10 cm size balls. If the same ball mill is used for wet grinding, charged with 20 cm diameter balls, the change in the operating speed in rpm is [round off to 2 decimal places] (Take π = 3.14 and g = 9.81 m s⁻²)
Correct : 3.88
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