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What happens to the quality of steam when it is expanded adiabatically? 5kg/s of 90% dry steam has to be generated at 30 bar absolute

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What happens to the quality of steam when it is expanded adiabatically? 5kg/s of 90% dry steam has to be generated at 30 bar absolute from boiler feed water at 70C. The overall efficiency of the boiler is 75%. Calculate the quantity of fuel oil required if the calorific value of the oil is 40106J/kg. [3+5]

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