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

Two are turning pairs and two are sliding pairs
Three are turning pairs and one is a sliding pair
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
Crowning on pulleys helps

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

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