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MECHANICAL OPERATIONS

Mechanical Operations
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

√2
√3
2
1.5

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Mechanical Operations
Equivalent diameter of a particle is the diameter of the sphere having the same

Ratio of volume to surface as the particle
Ratio of surface to volume as the actual volume
None of these
Volume as the particle

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Mechanical Operations
Sedimentation on commercial scale occurs in

Rotary drum filters
Thickeners
Classifiers
Cyclones

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Mechanical Operations
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be

3.34 Wi
1.34 Wi
0.5 Wi
Wi

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

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