Mechanical Operations
A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is

½w² . δρL (2R + δ)
½w² . δ² . ρL
½w² . R . ρL(R + 2δ)
½w² . R² . ρL

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

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