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Mechanical Operations

Mechanical Operations
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

3 to 4
15 to 20
10 to 15
8 to 10

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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

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

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Mechanical Operations
Jigging is a technique by which different particles can be

Separated by particle shape
Mixed
Separated by particle density
Separated by particle size

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Mechanical Operations
__________ centrifuge is the most suitable for separation of non-friable crystals.

Perforated horizontal basket continuous
Disc-bowl
Suspended batch basket
Tubular bowl

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Mechanical Operations
Stamp mills are generally used for crushing

Iron ores
Gold ores
Talc
Diamond

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Mechanical Operations
The maximum slope of a belt conveyor can be

45°
30°
60°
15°

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