Engineering Thermodynamics
Brayton cycle consists' of following four processes

Two isentropic and two constant volumes
Two isothermal and two isentropic
Two isentropic and two constant pressures
Two isentropic, one constant volume and one constant pressure

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

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

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