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21. A Carnot’s engine is made to work between 200°C and 0°C first and then between 0°C and –200°C. The ratio of efficiencies of the engine in the two cases is

(a) 1.73 : 1                                      (b)  1 : 1.73

(c)   1 : 1                                         (d)  1 : 2

Answer-b

(6)

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