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Mechanical Operations

Mechanical Operations
Froth floatation is the most suitable for treating

None of these
Quartzite
Sulphide ores
Iron ores

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Mechanical Operations
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by

Φs = 6 Vp/dp sp
Φs = dp Sp/Vp
Φs = Vp/dp sp
Φs = 6 dp Sp/Vp

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

Non-metallic ores
Rubber
Asbestos
Limestone

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Mechanical Operations
Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?

Ball mill
Rod mill
Gyratory crusher
Fluid energy mill

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Mechanical Operations
Fibrous material is broken by a

Rollcrusher
Squirrel-cage disintegrator
Tube mill
Ball mill

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

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

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