Theory of Machine
The pair is known as a higher pair, when the relative motion between the elements of a pair is

Sliding only
Rolling only
Partly turning and partly sliding
Turning only

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Theory of Machine
In a single slider crank chain

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
Three are turning pairs and one is a sliding pair

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