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Mechanical Operations

Mechanical Operations
For spheres, volume shape factor is given by

AD/V
2π(=2A/D²)
π(=A/D²)
π/6(=V/D³)

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Mechanical Operations
Screen efficiency is

Recovery
None of these
Rejection
Recovery/rejection

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Mechanical Operations
Horsepower required for a roll crusher is directly proportional to its

Reduction ratio
Both A & B
Capacity
Neither A nor B

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Mechanical Operations
In a roll crusher, the specific power consumption and the production rate is affected by the

Neither A nor B
Reduction ratio
Differential roll speed
Both A & B

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Mechanical Operations
Wet grinding in a revolving mill __________ as compared to dry grinding.

Increases capacity
Complicates handling of the product
Gives less wear on chamber walls
Requires more energy

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Mechanical Operations
Feed size of ≥ 25 cms can be accepted by

Rod mill
Jaw crusher
Fluid energy mill
Ball mill

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