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Mechanical Operations

Mechanical Operations
Carbon black is pulverised in a

Ball mill
Gyratory crusher
Hammer crusher
Roll crusher

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Mechanical Operations
The unit of specific cake resistance is

Gm/gm
Cm/gm
Gm/cm²
Cm/gm²

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Mechanical Operations
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.

1000°C and 500 atm
1000°C and 10 atm
500°C and 50 atm
200°C and 5 atm

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Mechanical Operations
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).

2/D.p
12/D.p
6/D.p
4/D.p

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Mechanical Operations
Paddle agitator

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

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Mechanical Operations
Screen efficiency is

None of these
Recovery/rejection
Recovery
Rejection

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