Determine mean effective pressure, Mechanical Engineering

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An oil engine works on the Dual cycle, the heat liberated at consent pressure being twice that liberated at consent volume. The compression ratio of the engine is 8 and the expansion ratio is 5.3. But the compression and expansion process follows the law PV1.3 = C. The pressure and temp. at beginning of compression are 1 Bar and 27^oC respectively. considering C_p =1.004 KJ/Kg ^oK and C_v =0.717 KJ/Kg ^oK for air, determine air standard efficiency and mean effective pressure.

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