Mechanical Operations
In a roll crusher, both the rolls

All of these
Run either at the same or different speeds
Are rotated towards each other
Have the same diameter

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Mechanical Operations
Bond crushing law

Calls for relatively less energy for the smaller product particles, than does the Rittinger law
Is less realistic in estimating the power requirements of commercial crushers
States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
States that the work required for the crushing is proportional to the new surface created

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

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