Pick out the wrong statement.

• Recycled coarse material to the grinder by a classifier is termed as circulating load.
• Wear and tear in wet crushing is more than that in dry crushing of materials.
• Size enlargement (opposite of size reduction) is not a mechanical operation.
• A 'dust catcher' is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas.