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Work index is defined as the
Options:
A
.
 Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
B
.
 Energy needed to crush one tonne of feed to 200 microns
C
.
 Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen
D
.
 Energy needed to crush one ton of feed to 100 microns
Answer: Option A
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