70. In a Rankine cycle steam enters the turbine at 2.5 MPa (enthalpies & entropies given) and

condenser of 50 kPa (properties given), what is the thermal efficiency of the cycle?

@ 2.5 MPa: hg = 2803.1 kJ/kg sg = 6.2575 kJ/kg-K

@ 50 kPa: sf = 1.0910 kJ/kg-K sfg = 6.5029 kJ/kg-K

hf = 340.49 kJ/kg hfg = 2305.4 kJ/kg

υf = 0.00103 m3

/kg

A. 25.55% B. 45.23% C. 34.23% D. 12.34%