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"A single-cylinder, four-stroke diesel engine operates on the dual combustion cycle. The engine has a bore of 200 mm, stroke of 250 mm, and clearance volume of 2.5 x 10^-4 m^3. The pressure and temperature at the start of compression are 1 bar and 27°C. If the maximum pressure is limited to 70 bar and heat added at constant pressure is equal to heat added at constant volume, calculate the cycle efficiency." mechanical technology 91 question paper exclusive