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Mechanical Operations

Mechanical Operations
The main size reduction operation in ultrafine grinders is

Cutting
Attrition
Impact
Compression

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Mechanical Operations
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)

π(=A/D²)
π/6(=V/D³)
None of these
AD/V

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Mechanical Operations
Energy consumption in a crusher decreases with increase in the

Size of feed (at constant reduction ratio)
Size of the product (at constant feed size)
Capacity of the crushing machine
All of these

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Mechanical Operations
200 mesh screen means 200 openings per

Inch
Cm
Inch²
Cm²

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Mechanical Operations
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the

Neither A nor B
Feed material
Both A & B
Type of crushing machine

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Mechanical Operations
Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m³)

3.6 D.V.ρ
3.6 W.V.ρ
3.6 W.D.V.
3.6 W.D.V.ρ

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