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

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 . δ² . ρL

½w² . R . ρL(R + 2δ)

½w² . δρL (2R + δ)

½w² . R² . ρL

½w² . δ² . ρL

½w² . R . ρL(R + 2δ)

½w² . δρL (2R + δ)

½w² . R² . ρL

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Mechanical Operations
Separation of solid particles based on their densities is called

Clarification

Sizing

Dispersion

Sorting

Clarification

Sizing

Dispersion

Sorting

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Mechanical Operations
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

1.34

0.5

1

4.34

1.34

0.5

1

4.34

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Mechanical Operations
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.

Smallest

Either A or B

Neither A nor B

Largest

Smallest

Either A or B

Neither A nor B

Largest

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Mechanical Operations
Carbon black is pulverised in a

Hammer crusher

Gyratory crusher

Ball mill

Roll crusher

Hammer crusher

Gyratory crusher

Ball mill

Roll crusher

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Mechanical Operations
Gravity stamp mill is meant for the __________ crushing.

Primary

Fine

Intermediate

Ultrafine

Primary

Fine

Intermediate

Ultrafine

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Mechanical Operations

Mechanical Operations Separation of solid particles based on their densities is called

Mechanical Operations In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.

Mechanical Operations Carbon black is pulverised in a

Mechanical Operations Gravity stamp mill is meant for the __________ crushing.

Mechanical Operations
Separation of solid particles based on their densities is called

Mechanical Operations
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.

Mechanical Operations
Carbon black is pulverised in a

Mechanical Operations
Gravity stamp mill is meant for the __________ crushing.