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what is the thermal efficiency in percentage of the Otto cycle?

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An ideal air standard Otto cycle has a compression ratio of 8.5 If the ratio of the specific heats of air (g) is 1.4, what is the thermal efficiency in percentage of the Otto cycle?                                                               

      (a) 57.5                                                               (b) 45.7

      (c) 52.5                                                               (d) 95

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