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Mechanical Operations

Mechanical Operations
Sauter mean diameter is the same as the __________ mean diameter.

Mass
Arithmetic
Geometric
Volume-surface

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Mechanical Operations
Grinding efficiency of a ball mill is of the order of __________ percent.

40-50
90-95
43835
75-80

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Mechanical Operations
200 mesh seive size corresponds to __________ microns.

74
154
200
24

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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.

1
0.5
1.34
4.34

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Mechanical Operations
For spheres, the specific surface shape factor is given by

D/V
A/V
√(AD/V)
AD/V

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Mechanical Operations
Sulphuric acid mist is arrested by using a __________ scrubber.

Packed wet
Venturi
Hollow wet
Co-current

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