A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

0.5

0.58

0.62

0.68

0.5

0.58

0.62

0.68

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Mechanical Operations
In constant pressure filtration,

Resistance decreases with time

Rate of filtration decreases with time

Rate of filtration increases with time

Rate of filtration is constant

Resistance decreases with time

Rate of filtration decreases with time

Rate of filtration increases with time

Rate of filtration is constant

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Mechanical Operations
Coal is finally pulverised to 200 mesh size for burning in boilers by a

Ball mill

Roll crusher

Gyratory crusher

Hammer crusher

Ball mill

Roll crusher

Gyratory crusher

Hammer crusher

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Mechanical Operations
Work index is defined as the

Energy needed to crush one tonne of feed to 200 microns

Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen

Energy needed to crush one ton of feed to 100 microns

Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen

Energy needed to crush one tonne of feed to 200 microns

Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen

Energy needed to crush one ton of feed to 100 microns

Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen

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Mechanical Operations
Which of the following terminology is not used for size reduction of materials to fine sizes or powders?

Dispersion

Compression

Comminution

Pulverisation

Dispersion

Compression

Comminution

Pulverisation

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Mechanical Operations
The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)

3.6 AVS/ρ

3.6 AVS.ρ

3.6 A.V.ρ

3.6 A.S. ρ

3.6 AVS/ρ

3.6 AVS.ρ

3.6 A.V.ρ

3.6 A.S. ρ

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Mechanical Operations

Mechanical Operations A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

Mechanical Operations In constant pressure filtration,

Mechanical Operations Coal is finally pulverised to 200 mesh size for burning in boilers by a

Mechanical Operations Work index is defined as the

Mechanical Operations Which of the following terminology is not used for size reduction of materials to fine sizes or powders?

Mechanical Operations The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)

Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

Mechanical Operations
In constant pressure filtration,

Mechanical Operations
Coal is finally pulverised to 200 mesh size for burning in boilers by a

Mechanical Operations
Work index is defined as the

Mechanical Operations
Which of the following terminology is not used for size reduction of materials to fine sizes or powders?

Mechanical Operations
The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)