Theory of Machine
Crowning on pulleys helps

In increasing velocity ratio
In decreasing the slip of the belt
Increase belt and pulley life
For automatic adjustment of belt position so that belt runs centrally

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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

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

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