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Mechanical Operations

Mechanical Operations
Which of the following is not categorised as a "mechanical operation"?

Filtration
Size enlargement
Agitation
Humidification

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Mechanical Operations
Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their

None of these
Terminal velocities
Particle sizes
Densities

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Mechanical Operations
Which is a secondary crusher for a hard & tough stone?

Jaw crusher
Impact crusher
Cone crusher
Toothed roll crusher

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Mechanical Operations
During size reduction by a jaw crusher, the energy consumed decreases with the

Increasing size of feed at constant reduction ratio
None of these
Decreasing machine capacity
Decreasing size of product at constant size of feed

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Mechanical Operations
For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter)

π(=A/D²)
AD/V
π/6(=V/D³)
None of these

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Mechanical Operations
Tabular bowl centrifuges as compared to disk bowl centrifuges

Can't be used for separation of fine suspended solids from a liquid
Can not be operated under pressure/vacuum
Operate at higher speed
Employ bowl of larger diameter

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