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Mechanical Operations

Mechanical Operations
In froth floatation, chemical agent added to cause air adherence is called

Activator
Frother
Collector
Modifier

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Mechanical Operations
Reduction ratio of crushers is the

Ratio of feed opening to discharge opening
None of these
Ratio of discharge opening to feed opening
Determining factor for minimum dia of the feed and the product

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Mechanical Operations
The process opposite to 'dispersion' is termed as the

Flocculation
Filtration
Sedimentation
None of these

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Mechanical Operations
In bag filters, filter fabrics are never made of

Cotton fibres
Metallic wire woven mesh
Polyester fibres
Nylon fibres

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Mechanical Operations
The grinding in a hammer crusher takes place due to the

Attrition
Both A & B
Impact
Neither A nor B

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

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