Theory of Machine
Maximum fluctuation of energy in a flywheel is equal to [where I = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, CS = Coefficient of fluctuation of speed, and ω = Mean angular speed = (ω₁ + ω₂)/2]

All of these
2.E.CS
I.ω.(ω₁ - ω₂)
I.ω².CS

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Theory of Machine
In gears, interference takes place when

Pitch of the gears is not same
Gear teeth are undercut
The tip of a tooth of a mating gear digs into the portion between base and root circles
Gears do not move smoothly in the absence of lubrication

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