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Mechanical Operations

Mechanical Operations
Carbon black is pulverised in a

Hammer crusher
Gyratory crusher
Ball mill
Roll crusher

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Mechanical Operations
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)

M . ρ/Vp
M . Vp/ρ
M/ρ . Vp
Vp/m . ρ

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Mechanical Operations
In constant pressure filtration,

Rate of filtration increases with time
Resistance decreases with time
Rate of filtration is constant
Rate of filtration decreases with time

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Mechanical Operations
As particle size is reduced

Capacity and effectiveness of the screen is increased
None of these
Screening becomes progressively more difficult
Screening becomes progressively easier

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Mechanical Operations
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge

Decreases
Increases
Increases linearly
Remains constant

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Mechanical Operations
__________ conveyors are also called scrapers.

Helical flight
Screw
Apron
Both B & C

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