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An air-standard thermodynamic cycle consists of isentropic compression with pressure ratio R, isobaric heat addition, isentropic expansion and isobaric heat rejection. The ratio of specific heats is denoted by Ī³, which expression gives the thermal efficiency:a.1-R(Ī³-1)/ Ī³b.1- R(1-Ī³)c.1-R(1- Ī³)/ Ī³d.1-R(Ī³-1)

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