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In ball mill operation, the feed size (Df in meters) and the ball diameter (Db in metres) are related as ( where, K = grindability constant (varying from 0.9 to 1.4 in increasing order of hard ness))

Db2 = K.Df
Db = K.Df
Db3 = K.Df
Db2 = K.Df2

Correct Answer: Db2 = K.Df

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