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

For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is

A

More

B

Less

C

Equal

D

More or less, depending on the type of particle

Drag co-efficient in hindered settling is __________ that in free settling.

A

Less than

B

Equal to

C

Not necessarily greater than

D

Always greater than

For a particle settling in water at its terminal settling velocity, which of the following is true?

A

Buoyancy = weight + drag

B

Weight = buoyancy + drag

C

Drag = buoyancy + weight

D

Drag = weight

__________ are used for the separation of coarse particles from a slurry of fine particles.

A

Thickeners

B

Classifiers

C

Hydrocyclones

D

Decanters

Electrostatic separation of minerals from each other is based on their differences in the following property.

A

Densities

B

Magnetic permeabilities

C

Electrical conductivities

D

Hardness

Two particles are called to be equal settling, if they are having the same.

A

Size

B

Specific gravity

C

Terminal velocities in the same fluid & in the same field of force

D

None of these

In classification, particles are said to be equal settling, if they have the same terminal velocities in the

A

Different fluids

B

Same fluid

C

Same field of force

D

Both B and C

In hindered settling, the particles are

A

Placed farther from the wall

B

Not affected by other particles and the wall

C

Near each other

D

None of these

Separation of solid particles based on their densities is called

A

Sizing

B

Sorting

C

Clarification

D

Dispersion

Solid particles separation based on the difference in their flow velocities through fluids is termed as the

A

Clarification

B

Classification

C

Elutriation

D

Sedimentation

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

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