The clutch of a motor car is required to transmit 9 kW at 3500 rpm. It is of single-plate type, with both sides of the plate being effective. The coefficient of friction is 0.25 and the maximum pressure is limited to 82 N/cm2. The ratio of diameters is 1.4. Assuming uniform wear determine:

A flat belt is required to transmit 35 kw from a pulley of 1.5 m effective diameter running at 300 rpm. The angle of contact spread over 11/24 of the circumference and the coefficient of friction between pulley and belt 0.3. Determine width of belt required. It is given that the belt thickness is 10mm, density of its material is 1.1Mg/m and the related permissible working stress is 2.5 Mpa.

A leather-faced cone clutch has a contact surface with a mean diameter of 15 in. and transinits 20 hy turning at 800 rpm. For a cone angle of 20 degrees and a coefficient of friction 0.30, determine the force required to keep the surface in contact. Ans. 121.5 lb.

...A plate clutch with single driving plate with contact surfaces on each is required to transmit 35 kW at 2400 rpm. Given that μ = 0.29, R = 1.25r, Pmax = 0.2 MPa, determine the inside radius of the frictional surface in mm.  Assume the uniform wear conditions.