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

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Theory of Machine
Kinematic pairs are those which have

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

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