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STEAM TURBINE %E0%A4%95%E0%A4%BE EFFICIENCY %E0%A4%95%E0%A5%88%E0%A4%B8%E0%A5%87 %E0%A4%A8%E0%A4%BF%E0%A4%95%E0%A4%BE%E0%A4%B2%E0%A5%87%E0%A4%82 EFFICIENCY CALCULATION