The torque coefficient of a particular design of a hydraulic coupling is given approximately by A 250mm diameter coupling using a working fluid of specific gravity 0.85 is driven by a motor running at...

The torque coefficient of a particular design of a hydraulic coupling is given approximately by

A 250mm diameter coupling using a working fluid of specific gravity 0.85 is driven by a motor running at 1450 rev min−1. What is the maximum torque which could be transmitted if the ‘slip’ is not to exceed 4 per cent? If the power output is to be increased by 20 per cent to what value should the input speed be increased in order to maintain the same slip?