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Mechanical Operations

Mechanical Operations
Size reduction mechanism used in Jaw crushers is

Cutting
Compression
Attrition
Impact

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Mechanical Operations
Two particles are called to be equal settling, if they are having the same.

None of these
Size
Terminal velocities in the same fluid & in the same field of force
Specific gravity

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Mechanical Operations
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration

At time zero
When half the filtrate has been obtained
At the end of filtration, but decreases with time subsequently
At the end of filtration

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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.

5000
500
50
5

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

Volume-surface
Geometric
Mass
Arithmetic

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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 ∝ 1/NRe
Np → constant
Np ∝ NRe

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