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Mechanical Operations

Mechanical Operations
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

√3
√2
2
1.5

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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
0.5
1.34
1

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Mechanical Operations
Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

Hard rubber
Resins
Waxes
Gums

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Mechanical Operations
With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge

Increases linearly
Decreases
Remains constant
Increases

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Mechanical Operations
__________ mills are termed as disintegrators.

All of these
Pebble
Cage
Compartment

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Mechanical Operations
The reduction ratio for fine grinders is

As high as 100
44124
43961
20-40

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