Pick out the wrong statement ?

A. Magnetic separation method can be employed to treat both dry & wet ores
B. Reduction ratio in crushing operation is defined as the ratio of minimum feed size to the
maximum product size

C. Gyratory crusher is used for coarse crushing
D. Screens are of stationary, moving and vibratory types

Pick out the wrong statement ?

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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