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]

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

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Theory of Machine
The maximum fluctuation of speed is the

Difference of the maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed
Sum of maximum and minimum speeds
Variations of speed above and below the mean resisting torque line

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