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Mechanical Operations

Mechanical Operations
Cyclones are used primarily for separating

Solids from fluids
Solids from solids
Liquids
Solids

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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.V.ρ
3.6 AVS.ρ
3.6 A.S. ρ
3.6 AVS/ρ

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Mechanical Operations
Sauter mean diameter is the same as the __________ mean diameter.

Volume-surface
Geometric
Arithmetic
Mass

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Mechanical Operations
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

Capacity of centrifuge is increased
Linear speed of the basket is halved
Centrifugal force is doubled
Linear speed of the basket is doubled

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Mechanical Operations
The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be

0.5 Wi
3.34 Wi
1.34 Wi
Wi

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Mechanical Operations
Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

Waxes
Resins
Gums
Hard rubber

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