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1) A gas turbine operates on an ideal Joule cycle using air (γ = 1.4; R...

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Mechanical Engineering

1) A gas turbine operates on an ideal Joule cycle using air (γ =1.4; R = 0.287 kJ/kg K) as working fluid. Air enters the compressorat temperature of 27◦C and pressure of 1.25 bar and is compressedto 7.6 bar. When the maximum cycle temperature is limited to 800oC, calculate,

(i) the thermal efficiency and work ratio of the cycle

(ii) the temperature of air exiting the turbine and the changein specific entropy of turbine process if the isentropic efficiencyof the turbine is 85%.

2) For an ideal Joule cycle, discuss the effects of pressureratio on the thermal efficiency using T-s diagram.

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