A refrigeration cycle operating between two reservoirs receives energy QC from a cold reservoir at TC = 280 K and rejects energy QH to a hot reservoir TH = 330 K. For each of the following cases determine whether the cycle operates reversibly, irreversibly, or is impossible: (a) QC = 1500 kJ, QH = 2200 kJ, (b) QC = 1500 kJ, Wcycle = 120 kJ, (c) QH = 1600 kJ, Wcycle = 500 kJ, (d) Coefficient of performance (COP) = 6.