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Mechanical Operations

Mechanical Operations
Which of the following is not a cutting machine?

Slitters
Knife cutters
Tube mills
Dicers

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Mechanical Operations
Trommels employ __________ for screening of materials.

Punched plate
Woven wire screen
Fibrous cloth
None of these

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

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

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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
5000
50
500

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Mechanical Operations
__________ is the most commonly used 'filter aid'.

Semi-plastic clay
Vermiculite
Fuller's earth
Diatomaceous earth

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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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