Mechanical Operations
Reduction ratio of crushers is the

Ratio of discharge opening to feed opening
Ratio of feed opening to discharge opening
Determining factor for minimum dia of the feed and the product
None of these

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Mechanical Operations
Bond crushing law

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
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
States that the work required for the crushing is proportional to the new surface created

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