Question A-2. In a speed increasing transmission system rotating in the clockwise direction, three vee belts, are connecting two pulleys to transfer the motion (Figure QA-2). The parameters associated with the transmission system are summarised in the table below. Number of belts Larger belt width Belt thickness Belt half-angle Distance between pulley shafts Diameter of larger pulley Diameter of smaller pulley Maximum permissible stress in the belt Coefficient of friction between belt and pulleys 3 50 mm 10 mm 25 500 mm 400 mm 100 mm 5 N/mm 0.31 Determine: a) the tight and slack sides of the belt. (4 marks) b) the lap angle of the smaller and larger pulleys (6marks) c) smaller width and the maximum permissible belt tension (5 marks) d) the slack side belt tension when the tight side tension is maximum. (6 marks) e) the transmitted power if the large pulley rotates at 300 rpm. (4 marks) D d Figure QA-2 4 D2