Question 1:
In a closed system 0.3 kg of gas at 373 K is expanded isothermally and reversibly from 1MPa pressure to 200 kPa. Given that Cv = 718 j/kg K and R = 287 J/kg K
Determine
(i) The work done
(ii) State the energy transfer within this isothermal process explaining your answer.
(i)
p1 = 1MPa
p2 = 200kPa
V1 = 0.3 kg
V2 = ?
Question 2:
Determine the thermal efficiency of a 60 MW output steam turbine supplied with 100 bar and 400oC steam. The steam exits turbine at 0.07 bar and dryness fraction 0.73. The flow rate of the steam is 45 kg/s.