Mechanical Operations
In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.

Primary
Fine
Secondary
Ultrafine

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Mechanical Operations
Bond crushing law

States that the work required for the crushing is proportional to the new surface created
States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
Is less realistic in estimating the power requirements of commercial crushers
Calls for relatively less energy for the smaller product particles, than does the Rittinger law

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