Engineering Thermodynamics
Carnot cycle efficiency is maximum when

Initial temperature is 0°K
Final temperature is 0°C
Final temperature is 0°K
Difference between initial and final temperature is 0°K

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

(Actual temperature drop)/(Isentropic temperature drop)
(Net work output)/(Work-done by the turbine)
(Isentropic increase in temperature)/(Actual increase in temperature)
(Net work output)/(Heat supplied)

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Engineering Thermodynamics
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

Heat is supplied to water at temperature below the maximum temperature of the cycle
A Rankine cycle receives heat at two places
Carnot cycle can't work with saturated steam
Rankine cycle is hypothetical

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