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.

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.

0.5

1

4.34

1.34

0.5

1

4.34

1.34

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Mechanical Operations
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

Flocculation

Centrifugation

Sedimentation

Dispersion

Flocculation

Centrifugation

Sedimentation

Dispersion

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Mechanical Operations
Dispersion of a gas through liquid is done by using a

None of these

Sparger

Masticator

Kneader

None of these

Sparger

Masticator

Kneader

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Mechanical Operations
During agitation of liquids, the

Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller

Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number

Froude number is independent for the curves between power number and Reynolds number in baffled system

All of these

Power number becomes independent of impellers Reynolds number at high Reynolds number, but is dependent on the geometry of the impeller

Froude number is used to account for the effect of surface (e.g., the centre vortex) on the power number

Froude number is independent for the curves between power number and Reynolds number in baffled system

All of these

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Mechanical Operations
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

1

4

1/4

1/2

1

4

1/4

1/2

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Mechanical Operations
Ball mill is used for

Fine grinding

Crushing

Attrition

Coarse grinding

Fine grinding

Crushing

Attrition

Coarse grinding

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Mechanical Operations

Mechanical Operations If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

Mechanical Operations Dispersion of a gas through liquid is done by using a

Mechanical Operations During agitation of liquids, the

Mechanical Operations In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

Mechanical Operations Ball mill is used for

Mechanical Operations
If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

Mechanical Operations
Dispersion of a gas through liquid is done by using a

Mechanical Operations
During agitation of liquids, the

Mechanical Operations
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

Mechanical Operations
Ball mill is used for