5. A power cycle operating between two thermal reservoirs receives energy QH by heat transfer from a hot reservoir at TH = 2000K and rejects Qc by heat transfer to a cold reservoir at Tc = 400K. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. [MO1, MO5,

MO6]

a. QH

b. QH

c. QH = 1000kJ, Wycle = 850kJ

1000kJ, E = 60%

1000kJ, Qr= 200kJ