Theory of Machine
In gears, interference takes place when

Gears do not move smoothly in the absence of lubrication
Gear teeth are undercut
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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Theory of Machine
Effort of a governor is the

Work-done at the sleeve for maximum equilibrium speed
Mean force exerted at the sleeve for a given percentage change of speed
None of these
Mean force exerted at the sleeve for maximum equilibrium speed

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