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
The drive is recommended depending upon the torque transmitted
Crossed belt drive is recommended

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Theory of Machine
Higher pairs are those which have

Two elements that permit relative motion
Elements of pairs not held together mechanically
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion

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