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Mechanical Operations

Mechanical Operations
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

Df/Dp
None of these
Df - Dp
Dp/Df

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Mechanical Operations
Ball mills and tube mills with flint or porcelain balls are used for size reduction of

Asbestos
Non-metallic ores
Limestone
Rubber

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Mechanical Operations
Which is a secondary crusher for a hard & tough stone?

Toothed roll crusher
Cone crusher
Impact crusher
Jaw crusher

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Mechanical Operations
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.

Buhrstone
Attrition
Roller
Pebble

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Mechanical Operations
Screw conveyors are

Suitable for highly abrasive materials
All of these
Suitable for sticky materials
Run at very high rpm

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Mechanical Operations
Sphericity of pulverised coal is

1
>1
∞

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