Engineering Thermodynamics
Carnot cycle efficiency is maximum when

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

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Engineering Thermodynamics
An isolated system is one in which

Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system
Mass crosses the boundary but not the energy
Mass does not cross boundaries of the system, though energy may do so

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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
Heat is supplied to water at temperature below the maximum temperature of the cycle
A Rankine cycle receives heat at two places
Rankine cycle is hypothetical

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