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Mechanical Operations

Mechanical Operations
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

None of these
Df/Dp
Df - Dp
Dp/Df

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Mechanical Operations
Ultrafine grinders operate principally by

Slow compression
Cutting action
Attrition
Impact

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Mechanical Operations
During the washing of cake

All the resistances are constant
Cake resistance decreases
Filter medium resistance increases
Filter medium resistance decreases

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Mechanical Operations
Trommels separate a mixture of particles depending on their

Wettability
Size
Density
Electrical & magnetic properties

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Mechanical Operations
For the transportation of ultrafine particles, the equipment used is a........conveyor.

Pneumatic
Screw
None of these
Belt

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Mechanical Operations
In case of a hammer crusher, the

Maximum feed size may be 50 mm
Minimum product size is 3 mm
Rotor shaft carrying hammers can be vertical or horizontal
Feed may be highly abrasive (Moh's scale >5)

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