Mechanical Operations
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.

Fine
Secondary
Primary
Ultrafine

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Mechanical Operations
In case of a hammer crusher,

Crushing takes place by impact breaking
Reduction ratio can be varied by adjusting the distance from cage to hammers
All of these
Maximum acceptable feed size is 30 cms

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