Mechanical Operations
Cumulative analysis for determining surface is more precise than differential analysis, because of the

Assumption that all particles in a single fraction are equal in size
Assumption that all particles in a single fraction are equal in size, is not needed
None of these
Fact that screening is more effective

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Mechanical Operations
Rod mills employed for grinding

Employ a steel shell having L/D ratio of 1.5 to 3.0
All of these
Employ steel rods of 2-12 cms diameter extending over full length of the mill
Is useful for handling sticky materials

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