Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Completely constrained motion
Partially constrained motion
Incompletely constrained motion
Successfully constrained motion

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Theory of Machine
In a four bar chain or quadric cycle 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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