A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir at TC 5 275 K and rejects energy QH to a hot reservoir at TH 5 315 K. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible: (a) QC 5 1000 kJ, Wcycle 5 80 kJ. (b) QC 5 1200 kJ, QH 5 2000 kJ. (c) QH 5 1575 kJ, Wcycle 5 200 kJ. (d) 5 6.