Theory of Machine
In a single slider crank chain

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

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Theory of Machine
In gears, interference takes place when

Pitch of the gears is not same
Gears do not move smoothly in the absence of lubrication
The tip of a tooth of a mating gear digs into the portion between base and root circles
Gear teeth are undercut

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