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Mechanical Operations

Mechanical Operations
Which of the following is not used as a surface active agent in a flocculation operation?

Quartz
Alumina
Lime
Sodium silicate

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Mechanical Operations
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.

Middling
Tailing
Concentrate
None of these

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Mechanical Operations
Jigging is a technique by which different particles can be

Separated by particle size
Separated by particle shape
Mixed
Separated by particle density

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Mechanical Operations
Gelatinous solid (which plug the septum) can be filtered by a __________ filter.

Vacuum leaf
Precoat
Plate and frame
Sparkler

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Mechanical Operations
The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)

3.6 A.S. ρ
3.6 AVS.ρ
3.6 AVS/ρ
3.6 A.V.ρ

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

Collector
Modifier
Activator
Frother

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