Theory of Machine
To connect two parallel and coplanar shafts the following type of gearing is used

Spiral gear
Spur gear
None of the listed here
Bevel gear

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Theory of Machine
In a four bar chain or quadric cycle chain

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

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