gas-turbine engine with regeneration operates with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and the turbine is 3.5. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1250 K. The compressor and the turbine efficiencies are 80% and 82%, respectively, and the effectiveness of the regenerator is 74%. Assuming variable specific

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