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A Carnot's engine is made to work between $200^{0} C and O^{o} C$ first and then between $0^{0} C and - 200^{0} C$ . The ratio of efficiencies of the engine in the two cases is

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1 : 73 . 1

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Correct option is B

In first case η1 = 1- T2T1 = 1-(273+0)(273+200) = 200473In second case η2 = 1-(273-200)(273+0) = 200273⇒η1η2 = 1(473273) = 1 : 1 . 73

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A Carnot's engine is made to work between 2000C and OoC first and then between 00C and -2000C. The ratio of efficiencies of the engine in the two cases is

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A Carnot's engine is made to work between $200^{0} C and O^{o} C$ first and then between $0^{0} C and - 200^{0} C$ . The ratio of efficiencies of the engine in the two cases is