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Mechanical Operations

Mechanical Operations
Screen efficiency is

Rejection
Recovery
Recovery/rejection
None of these

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Mechanical Operations
Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about

1 to 2°
2 to 5°
10 to 15°
5 to 10°

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Mechanical Operations
Addition of filter aid to the slurry before filtration is done to ...... of the cake.

Increase the porosity
Decrease the porosity
Decrease the compressibility co-efficient
Increase the compressibility co-efficient

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Mechanical Operations
In constant pressure filtration,

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

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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.

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

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Mechanical Operations
Sphericity of pulverised coal is

1
>1
∞

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