Theory of Machine
The example of successfully constrained motion is a

Piston reciprocating inside an engine cylinder
Motion of an I.C. engine valve
All of these
Motion of the shaft between a footstep bearing

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Theory of Machine
In a single slider crank chain

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

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