Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

Perpendicular to the link joining the points
At 45° to the link joining the points
None of the listed here
Parallel to the link joining the points

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Theory of Machine
In a single slider crank chain

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

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