Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Longest link is a fixed link
Slider is a fixed link
Smallest link is a fixed link
Coupler link is fixed

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Theory of Machine
In gears, interference takes place when

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
Gear teeth are undercut
Gears do not move smoothly in the absence of lubrication

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