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Mechanical Operations

Mechanical Operations
Cyclones are used primarily for separating

Liquids
Solids
Solids from solids
Solids from fluids

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Mechanical Operations
increasing the capacity of a screen __________ the screen effectiveness.

Decreases
None of these
Increases
Does not effect

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Mechanical Operations
In the cyclone separator used for separation of dust from dust laden gas, the gas

Is admitted tangentially at high velocity
Enters the cyclone from the top
Develops a helical motion inside the chamber
Both B and C

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Mechanical Operations
At low Reynold's number, the power (P) required for agitating a fluid in a stirred tank becomes independent of inertial forces. In this limit, indicate which of the following relations is satisfied: Po = ρ/ρN3 D5 : Power number Re = ρ N D2/μ: Reynold's number N is the impeller rotational speed, and D is the impeller diameter.

Po ∝ Re0.5
Po ∝ Re1.0
Po ∝ Re-1.0
Po ∝ Re0.0

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Mechanical Operations
Mass flow of granular solid (M) through a circular opening of dia, D follows

M ∝ D²
M ∝ D
M ∝ D³
M ∝ √D

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Mechanical Operations
200 mesh screen means 200 openings per

Cm
Inch
Cm²
Inch²

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