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Mechanical Operations

Mechanical Operations
To remove dirt from the flowing fluid, we use a

Coagulant
Clarifier
Gravity settler
Strains

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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 W.Dr.ρ
3.6 V.W.Dr/ρ
3.6 V.W. ρ

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Mechanical Operations
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by

Φs = Vp/dp sp
Φs = dp Sp/Vp
Φs = 6 dp Sp/Vp
Φs = 6 Vp/dp sp

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Mechanical Operations
Maximum size reduction in a fluid energy mill is achieved by

Cutting
Compression
Interparticle attrition
Impact

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Mechanical Operations
Which of the following conveyors cannot be recommended for transportation of abrasive materials?

Chain conveyor
Belt conveyor
Flight conveyor
Apron conveyor

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Mechanical Operations
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

4
1/4
1/2
1

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