A. Gape is the greatest distance between the crushing surfaces or the jaws
B. The angle of nip (2α) is the angle between roll faces at the level where they will just take hold
of a particle and draw it in the crushing zone
C. Crushing efficiency is the ratio of the energy absorbed by the solid to the surfaces energy
created by crushing
D. Reduction ratio is the ratio of the maximum size of the particles in the feed to that in the
product
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