Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

• A. Partially condensed vapour with quality of 0.1
• B. Saturated vapour
• C. Superheated vapour
• D. Partially condensed vapour with quality of 0.9

Answer: (C)