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The turning moment diagram for a four-stroke gas engine may be assumed for simplicity to be represented by four triangles, the areas of which from the line of zero pressure follows: %3D Expansion stroke= 3550mm2; exhaust stroke =500mm2; suction stroke = 350mm2; and compression stroke= 1400mm2. Each mm? represents 3N-m. Assuming the resisting moment to be uniform, find the mass of the rim of a flywheel required to keep the mean speed 200 rp.m within + 2%. The mean radius of the rim may be taken as 0.75m. also determine the crank positions for the maximum and minimum speeds. mean 4 Line of zero pressure Compression Expunsion Exhaust Suction Crank angle (e)


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