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2) A heat engine operates between two fixed temperature reservoirs, TH = 127 0C, TC =...

2) A heat engine operates between two fixed temperature reservoirs, TH = 127 0C, TC = 7 0C. In each cycle 5 J are extracted from the hot reservoir and 4 J are deposited into the cold reservoir. [ 0 0C = 273 K] (a) How much work is performed by the engine per cycle ? (4) (b) What is the efficiency of the engine ? (4) (c) What is the entropy change of the hot reservoir during one cycle ? (4) (d) What is the entropy change of the cold reservoir during one cycle ? (4) (e) What is the entropy change of the engine itself during one cycle ? Is the engine reversible of irreversible ? (3) (f) What is the efficiency of an ideal (Carnot) engine operating between the same two reservoirs?

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