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

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Theory of Machine
In a four bar chain or quadric cycle chain

Three are turning pairs and one is a sliding pair
Two are turning pairs and two are sliding pairs
One is a turning pair and three are sliding pairs
Each of the four pairs is a turning pair

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Theory of Machine
Higher pairs are those which have

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

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