A multi-plate clutch has four pairs of frictional surfaces, each of internal diameter 120 mm and  external diameter 200 mm. If the coefficient of friction is 0.3 and the uniform pressure condition  can be assumed, what is the required spring force when the plates transmit 20 kW at 1400 rpm?

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Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.