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15. In a Carnot engine, when

T2=0°C  and T1=200°C  its efficiency is η1 and when T1=0°C  and T2=200°C , Its efficiency is η2 , then what is η1 / η2

(a)  0.577                                         (b)  0.733

(c)   0.638                                       (d)  Can not be calculated

Answer-a

(11)

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