Mechanical Operations
Toothed roll crushers achieve size reduction by

Neither A nor B
Tearing (shear) and compression
Impact and attrition
Both A & B

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

Fact that screening is more effective
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

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