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Mechanical Operations

Mechanical Operations
Fick's law relates to

None of these
Energy consumption
Final particle size
Feed size

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Mechanical Operations
Diatomaceous earth is a/an

Catalyst
Filter aid
Filter medium
Explosive

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

Jaw crusher
Cone crusher
Toothed roll crusher
Impact crusher

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Mechanical Operations
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is

6.35 kWh/ton
25.4 kWh/ton
18 kWh/ton
9.0 kWh/ton

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Mechanical Operations
During agitation of liquids, power consumption during laminar flow is not proportional to the

Square of rotational speed
Density of the liquid
Viscosity of the liquid
Cube of impeller diameters

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

D
1.5 D
0.5 D
2 D

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