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Mechanical Operations

Mechanical Operations
Fluid energy mill comes in the category of

Grinder
Crusher
Cutter
Ultrafine grinder

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Mechanical Operations
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )

1/D2.5
D
1/D
D2.5

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Mechanical Operations
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re0.0
Po ∝ Re1.0
Po ∝ Re0.5
Po ∝ Re-1.0

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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.D.V.ρ
3.6 W.D.V.
3.6 W.V.ρ

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Mechanical Operations
For sizing of fine materials, the most suitable equipment is a

Trommel
Vibrating screen
Shaking screen
Grizzly

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Mechanical Operations
Filtration should be stopped in a filter press, if the

Cake becomes very dense
Liquor stops flowing out to the discharge
Filtration pressure rises suddenly
Both A & B

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