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

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Mechanical Operations
In case of a hammer crusher,

Reduction ratio can be varied by adjusting the distance from cage to hammers
All of these
Crushing takes place by impact breaking
Maximum acceptable feed size is 30 cms

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

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