Discussion

Match the following types of mill in Column I based on their grinding mechanisms in Column II.

Answer: A

The correct match is P-3; Q-2; R-4; S-1.

A roller mill nips the material between rolls turning at different speeds, so it grinds by compression and shear (1).
A ball mill tumbles grinding balls in a rotating drum; falling balls strike the material and rolling balls rub it, giving impact and abrasion (2).
A hammer mill breaks material mainly by the impact of swinging hammers, with shear against the screen and breaker plate (4).
An attrition mill grinds between two plates, one or both rotating, which crush and rub the material: crushing and shear (3).

The second option makes the attrition mill an impact mill, and the third and fourth give the roller mill an impact mechanism, which it does not use.

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