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Mechanical Operations

Mechanical Operations
Which of the following is not a non-metalliferous mineral?

Calcite
Fluorspar
Quartz
Cassiterrite

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Mechanical Operations
For coarse reduction of hard solids, use

Impact
Compression
Attrition
Cutting

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Mechanical Operations
In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Schmidt
Brinkman
Weber
Peclet

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Mechanical Operations
Washability curve based on float and sink test enables an assessment to be made of the possibility of cleaning a coal fraction based on the

Size
Density separation
Differential wettability
Volatile matter content

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Mechanical Operations
Wet grinding in a revolving mill __________ as compared to dry grinding.

Complicates handling of the product
Increases capacity
Requires more energy
Gives less wear on chamber walls

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Mechanical Operations
The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).

Dp
1/D²p
D²p
1/Dp

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