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Mechanical Operations

Mechanical Operations
__________ mills are termed as impactors.

None of these
Rolling-compression
Cage
Hammer

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Mechanical Operations
Specific surface area is the surface area of a unit __________ of materials.

Volume
Either A or B
Weight
Neither A nor B

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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
Size reduction of asbestos and mica is done by

Crushing rolls
Hammer mills
Gyratory crushers
Rod mills

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Mechanical Operations
In closed circuit grinding as compared to open circuit grinding, the

Operation is economical
Production rate at a given limiting size is lower
Product has lesser size uniformity
Specific surface of product is more

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Mechanical Operations
The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

Same as
2.5 times
10 times
5 times

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