Q5/ An open belt connects two flat pulleys. The pulley diameters are 300 mm and 450 mm and the corresponding angles of lap are 160° and 210°. The smaller pulley runs at 200 r.p.m. The coefficient of friction between the belt and pulley is 0.25. It is found that the belt is on the point of slipping when 3 kW is transmitted. To increase the power transmitted two alternatives are suggested, namely (i) increasing the initial tension by 10%, and (i) increasing the coefficient of friction by 10% by the application of a suitable dressing to the beit. Which of these wo methods would be more effective? Find the percentage increase in power possible in each case.