Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Completely constrained motion
Incompletely constrained motion
Partially constrained motion
Successfully constrained motion

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Theory of Machine
In gears, interference takes place when

Gear teeth are undercut
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
Pitch of the gears is not same

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