6. The specific surface of sherical particles is proportional to (where, Dp = diameter of particle).
7. Wet grinding in a revolving mill __________ as compared to dry grinding.
8. Trommels employ __________ for screening of materials.
9. Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.
10. increasing the capacity of a screen __________ the screen effectiveness.
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