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Mechanical Operations

Mechanical Operations
__________ mills are termed as impactors.

Hammer
None of these
Cage
Rolling-compression

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Mechanical Operations
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

1
0.5
4.34
1.34

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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

230
460
2250
1125

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Mechanical Operations
Width and speed of a conveyor belt depends upon the __________ of the material.

Both A & B
Neither A nor B
Lump size
Bulk density

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Mechanical Operations
Which of the following conveyors cannot be recommended for transportation of abrasive materials?

Apron conveyor
Belt conveyor
Chain conveyor
Flight conveyor

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Mechanical Operations
Which is the most suitable conveyor for transportation of sticky material?

Pneumatic conveyor
Belt conveyor
Apron conveyor
Screw conveyor

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