Theory of Machine
Length of arc of contact is given by

Arc of approach + Arc of recess
Arc of approach / Arc of recess
Arc of approach - Arc of recess
Arc of approach × Arc of recess

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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

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

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