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

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

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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
Both open belt drive and crossed belt drive is recommended
Open belt drive is recommended
Crossed belt drive is recommended

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