A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is

Mechanical Operations
A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is

½w² . R² . ρL

½w² . R . ρL(R + 2δ)

½w² . δ² . ρL

½w² . δρL (2R + δ)

½w² . R² . ρL

½w² . R . ρL(R + 2δ)

½w² . δ² . ρL

½w² . δρL (2R + δ)

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Mechanical Operations
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

Ultrafine

Fine

Primary

Secondary

Ultrafine

Fine

Primary

Secondary

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Mechanical Operations
Dry powdery solid materials are transported by a __________ conveyor.

Bucket

None of these

Belt

Screw

Bucket

None of these

Belt

Screw

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Mechanical Operations
Separation of solid particles based on their densities is called

Sizing

Dispersion

Sorting

Clarification

Sizing

Dispersion

Sorting

Clarification

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Mechanical Operations
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Np ∝ NRe

Np ∝ 1/NRe

Np → constant

Np ∝ √NRe

Np ∝ NRe

Np ∝ 1/NRe

Np → constant

Np ∝ √NRe

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Mechanical Operations
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

0.3

50

0.014

0.007

0.3

50

0.014

0.007

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Mechanical Operations

Mechanical Operations In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

Mechanical Operations Dry powdery solid materials are transported by a __________ conveyor.

Mechanical Operations Separation of solid particles based on their densities is called

Mechanical Operations For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Mechanical Operations Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

Mechanical Operations
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

Mechanical Operations
Dry powdery solid materials are transported by a __________ conveyor.

Mechanical Operations
Separation of solid particles based on their densities is called

Mechanical Operations
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Mechanical Operations
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.