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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Theory of Machine
Effort of a governor is the

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

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