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

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

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Theory of Machine
In gears, interference takes place when

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

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