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
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

Jaw crusher, Ball mill, Fluid energy mill
Fluid energy mill, Ball mill, Jaw crusher
Ball mill, Jaw crusher, Fluid energy mill
Fluid energy mill, Jaw crusher, Ball mill

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