Which one of the following statements is correct?
1
The Rankine cycle efficiency can be improved by increasing the average temperature at which heat is rejected
2
The Rankine cycle efficiency can be improved by decreasing / reducing the temperature at which heat is rejected
3
If the steam is superheated before allowing it to expand the Rankine cycle efficiency may be decreased
4
The thermal efficiency of the Rankine cycle can be amply improved by increasing the condenser pressure