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Mechanical Operations

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

Classifiers
Decanters
Thickeners
Hydrocyclones

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Mechanical Operations
Ultra centrifuges are used for the separation of __________ solid particles.

Colloidal
Coarse
Dissolved
Fine

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Mechanical Operations
The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is

None of these
1.5
?2
1

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Mechanical Operations
Crushing efficiency of a machine ranges between __________ percent.

5 to 10
50 to 70
0.1 to 2
20 to 25

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Mechanical Operations
The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the

Venturi atomiser
Gravity settling chamber
Electro-static precipitator
Cyclone separator

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Mechanical Operations
To get ultrafine particles, the equipment used is a

Ball mill
Hammer crusher
Fluid energy mill
Rod mill

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