Consider a steam power plant using a reheat cycle as shown.

Question

Common Data for Question 1 & 2

Consider a steam power plant using a reheat cycle as shown. Steam leaves the boiler and enters the turbine at 4 MPa, 350⁰C (h₃ = 3095 kJ/kg). After expansion in the turbine to 400 kPa (h₄ = 2609 kJ/kg), the steam is reheated to 350⁰C (h₅ = 3170 kJ/kg), and then expanded in a low pressure turbine to 10 kPa (h₆ = 2165 kJ/kg).

1. The thermal efficiency of the plant neglecting pump work is                                                                                                  

      (a) 15.8%                                                            (b) 41.1%

      (c) 48.5%                                                            (d) 58.6%

 

       2 .  The enthalpy at the pump discharge (h₂) is                               

      (a) 0.33 kJ/kg                                                      (b) 2.33 kJ/kg

      (c) 4.0 kJ/kg                                                        (d) 33.3 kJ/kg