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Mechanical Operations

Mechanical Operations
The crushed material received for separation is called feed or

Tailing
Heading
Concentrate
Middling

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Mechanical Operations
Paddle agitator

None of these
Is suitable for mixing low viscosity liquids
Produces axial flow
Moves at very high speed

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

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Mechanical Operations
Fluid energy mill comes in the category of

Crusher
Grinder
Cutter
Ultrafine grinder

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Mechanical Operations
During size reduction by a jaw crusher, the energy consumed decreases with the

Decreasing size of product at constant size of feed
None of these
Increasing size of feed at constant reduction ratio
Decreasing machine capacity

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Mechanical Operations
For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.

500
5000
5
50

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