Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

British standard screens

American standard screens (ASTM and Tyler standard screens)

All of these

German standard screens (DIN 1171) etc

British standard screens

American standard screens (ASTM and Tyler standard screens)

All of these

German standard screens (DIN 1171) etc

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Mechanical Operations
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)

Vp/m . ρ

M . Vp/ρ

M . ρ/Vp

M/ρ . Vp

Vp/m . ρ

M . Vp/ρ

M . ρ/Vp

M/ρ . Vp

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Mechanical Operations
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

D

1/d

√d

D²

D

1/d

√d

D²

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Mechanical Operations
Trommels employ __________ for screening of materials.

None of these

Punched plate

Woven wire screen

Fibrous cloth

None of these

Punched plate

Woven wire screen

Fibrous cloth

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Mechanical Operations
In a roll crusher, the specific power consumption and the production rate is affected by the

Neither A nor B

Both A & B

Reduction ratio

Differential roll speed

Neither A nor B

Both A & B

Reduction ratio

Differential roll speed

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Mechanical Operations
Crushing efficiency of a machine ranges between __________ percent.

50 to 70

5 to 10

20 to 25

0.1 to 2

50 to 70

5 to 10

20 to 25

0.1 to 2

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Mechanical Operations

Mechanical Operations Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

Mechanical Operations Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)

Mechanical Operations For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

Mechanical Operations Trommels employ __________ for screening of materials.

Mechanical Operations In a roll crusher, the specific power consumption and the production rate is affected by the

Mechanical Operations Crushing efficiency of a machine ranges between __________ percent.

Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

Mechanical Operations
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)

Mechanical Operations
For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (d) as

Mechanical Operations
Trommels employ __________ for screening of materials.

Mechanical Operations
In a roll crusher, the specific power consumption and the production rate is affected by the

Mechanical Operations
Crushing efficiency of a machine ranges between __________ percent.