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Mechanical Operations

Mechanical Operations
Fibrous material is broken by a

Ball mill
Squirrel-cage disintegrator
Rollcrusher
Tube mill

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Mechanical Operations
In case of a hammer crusher, the final product size depends on the

Feed rate
Rotor speed
Clearance between hammer & grinding plates
All of these

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Mechanical Operations
For the transportation of ultrafine particles, the equipment used is a........conveyor.

Belt
Screw
None of these
Pneumatic

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Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 V.W.Dr.ρ
3.6 V.W.Dr/ρ
3.6 V.W. ρ
3.6 W.Dr.ρ

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Mechanical Operations
Screen capacity is not a function of

Screening surface
Its openings size
Screening mechanism
Atmospheric humidity

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Mechanical Operations
Bucket elevators are not suitable for the vertical lifting of __________ materials.

Sticky (e.g. clay paste)
Fine (e.g. - 200 mesh size coal)
Small lumpy (e.g. grains and sand)
Free flowing

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