An inventor claims to have invented four engines, each of which operates between constant-temperature reservoirs at 400 and 300 K. Data on each engine, per cycle of operation, are: engine A, QH = 200 J, QL= –175 J, and W = 40 J; engine B, QH = 500 J, QL = –200 J, and W = 400 J; engine C, QH = 600 J, QL = –200 J, and W = 400 J; engine D, QH = 100 J, QL = –90 J, and W = 10 J. Of the first and second laws of
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