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Mechanical Operations

Mechanical Operations
For transporting pasty material, one will use a/an

Apron conveyor
Belt conveyor
Bucket elevator
Screw colaveyor

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Mechanical Operations
Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is

Kg/sec
KW. sec/kg
KWh/kg
KWh/sec. kg

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Mechanical Operations
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

Concrete
Bronze
Flint or porcelain
Stainless steel

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Mechanical Operations
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

4.34
1.34
0.5
1

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Mechanical Operations
Reciprocal of sphericity is termed as the

Sauter diameter
Specific surface ratio
Surface area per unit mass
Shape factor

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Mechanical Operations
The unit of specific cake resistance is

Gm/gm
Cm/gm
Cm/gm²
Gm/cm²

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