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

4.34

1

1.34

0.5

4.34

1

1.34

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Mechanical Operations
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

State or manner of application of the crushing force

All of these

Ultimate strength of the material

Elastic constant of the material

State or manner of application of the crushing force

All of these

Ultimate strength of the material

Elastic constant of the material

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Mechanical Operations
__________ is used for producing a thick suspension from a thin slurry.

Cartridge filter

Rotary drum vacuum filter

Pressure filter thickener

Plate and frame filter press

Cartridge filter

Rotary drum vacuum filter

Pressure filter thickener

Plate and frame filter press

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Mechanical Operations
Out of the following size reduction equipments, the maximum feed size can be accepted by the

Tube mill

Jet pulveriser

Ball mill

Jaw crusher

Tube mill

Jet pulveriser

Ball mill

Jaw crusher

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Mechanical Operations
Rittinger's crushing law states that

For a given machine and feed, crushing efficiency is dependent on the size of the feed & product

Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product

Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product

Work required in crushing is proportional to the new surface created

For a given machine and feed, crushing efficiency is dependent on the size of the feed & product

Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product

Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product

Work required in crushing is proportional to the new surface created

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Mechanical Operations
Tube mill compared to ball mill

All of these

Uses smaller balls

Produces finer products

Is long in comparison with its diameter

All of these

Uses smaller balls

Produces finer products

Is long in comparison with its diameter

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Mechanical Operations

Mechanical Operations Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Mechanical Operations __________ is used for producing a thick suspension from a thin slurry.

Mechanical Operations Out of the following size reduction equipments, the maximum feed size can be accepted by the

Mechanical Operations Rittinger's crushing law states that

Mechanical Operations Tube mill compared to ball mill

Mechanical Operations
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Mechanical Operations
__________ is used for producing a thick suspension from a thin slurry.

Mechanical Operations
Out of the following size reduction equipments, the maximum feed size can be accepted by the

Mechanical Operations
Rittinger's crushing law states that

Mechanical Operations
Tube mill compared to ball mill