The efficiency of Rankine cycle is lower than that of corresponding Carnot cycle because
1
the Carnot cycle has gas as working substance and Rankine cycle has steam as working substance
2
the Rankine cycle efficiency depends upon properties of working substance whereas Carnot cycle efficiency is independent of the properties of working substance
3
the temperature range of Carnot cycle is greater than that for Rankine cycle
4
the average temperature at which heat is supplied in Rankine cycle is less than that corresponding Carnot cycle
5
Question Not Attempted