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Mechanical Operations

Mechanical Operations
__________ mill is not a revolving mill.

Compartment
Tube
Cage
Pebble

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Mechanical Operations
For spheres, volume shape factor is given by

AD/V
2π(=2A/D²)
π(=A/D²)
π/6(=V/D³)

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Mechanical Operations
Handling of ashes and similar materials can be done best by a __________ conveyor.

Ribbon
Drag or slat
Flight
Belt

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Mechanical Operations
Sulphuric acid mist is arrested by using a __________ scrubber.

Co-current
Packed wet
Venturi
Hollow wet

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Mechanical Operations
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by

Φs = 6 dp Sp/Vp
Φs = Vp/dp sp
Φs = dp Sp/Vp
Φs = 6 Vp/dp sp

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Mechanical Operations
Limestone is normally crushed in a

Roll crusher
Hammer crusher
Tube mill
Ball mill

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