Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is(Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

μwr
½μWR
¾μWR
²/₃ μWR

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Both open belt drive and crossed belt drive is recommended
Open belt drive is recommended
Crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted

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