Air enters the compressor of a gas-turbine engine at 300 K and 100 kPa, where it is compressed to 700 kPa and 580 K. Heat is transferred to air in the amount of 950 kJ/kg before it enters the turbine. For a turbine efficiency of 86 percent, determine: (a)  the fraction of turbine work output used to drive the   compressor, (b)  the thermal efficiency. Assume:       constant specific heats at 300 K. Ans: 50.1%, 29.6%

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