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Q9. A four-stroke single cylinder engine produces 750 kW at 720 rev/min. Fluctuation of energy is 20% of work done per cycle. A flywheel is to be fitted in order to stabilise the speed for power generation. The frequency must not fluctuate more than ± 0.2 Hz from the standard 60 Hz. Calculate the diameter of a 0.2 m thick solid flywheel. (16)

Note:

The density of the flywheel material = 7800 kg/m³.