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Mechanical Operations

Mechanical Operations
Mixing of light fine powder such as insecticides is done by

Pug mill
Banbery mixer
Impact wheels
Kneader

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Mechanical Operations
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Np ∝ √NRe
Np → constant
Np ∝ 1/NRe
Np ∝ NRe

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Mechanical Operations
In case of a revolving mill, wet grinding compared to dry grinding

Has less capacity
Requires more energy
Complicates handling & classification of the product
None of these

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Mechanical Operations
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?

Crush shaft
Toggles
Check plates
Jaw plates

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Mechanical Operations
In filtration, the use of 'filter aid' helps in

Accelerating the rate of filtration
Reducing the filtration pressure
Enhancing the cake porosity in case of a dense impermeable cake
Deplugging the filter medium

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Mechanical Operations
For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns.

5
500
50
5000

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