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Mechanical Operations

Mechanical Operations
__________ are used for the separation of coarse particles from a slurry of fine particles.

Hydrocyclones
Thickeners
Classifiers
Decanters

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Mechanical Operations
In screen analysis, the notation +5 mm/-10 mm means particles passing through

5 mm screen and retained on 10 mm screen
10 mm screen and retained on 5 mm screen
Neither 5 mm nor 10 mm screen
Both 5 mm and 10 mm screens

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Mechanical Operations
For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is

1125
460
230
2250

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Mechanical Operations
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.

Slat or drag
Screw
Ribbon
Flight

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Mechanical Operations
Cement clinker is reduced to fine size by a

Hammer mill
Tube mill
Roll crusher
Ball mill

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Mechanical Operations
The critical speed of a trommel (N) is related to its dia (D) as

N ∝ 1/√D
N ∝ √D
N ∝ 1/D
N ∝ D

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