Theory of Machine
In higher pair, the relative motion is

Purely turning
Combination of sliding and turning
Purely rotary
Purely sliding

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Theory of Machine
In gears, interference takes place when

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

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