Theory of Machine
In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

Could change or remain unaltered depending on which link is fixed
Will not occur
Will change
Will remain same

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Theory of Machine
In gears, interference takes place when

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

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