Theory of Machine
Flexible coupling is used because

It is easy to engage and disengage
It prevents shock transmission and eliminates stress reversals
It is easy to disassemble
It transmits shocks gradually

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Theory of Machine
In a single slider crank chain

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

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