Engineering Thermodynamics
If a system after undergoing a series of processes, returns to the initial state then

Process is thermodynamically in equilibrium
Its entropy will change due to irreversibility
Sum of heat and work transfer will be zero
Process is executed in closed system cycle

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

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

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