Which of the following mill works on the principle of
WEB2/27/2022. View full document. 32. Which of the following mill works on the principle of combined impact and attrition? a) Hammer mill b) Ball mill c) Disintegrator mill d) Roller mill. 33. In Ball mill, how much volume should be occupied by material: a) 30% b) 20% c) 50% d)60%. 34.