Theory of Machine
The gear train usually employed in clocks is a

Reverted gear train
Simple gear train
Sun and planet gear
Differential gear

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Theory of Machine
In gears, interference takes place when

Pitch of the gears is not same
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
Gear teeth are undercut

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