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A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by 40°C,

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A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by 40°C, its efficiency increases by 30%. The temperature of the source will be : 

(A) 166.7 K 

(B) 255.1 K 

(C) 266.7 K 

(D) 367.7 K

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Correct option is (C) 266.7 K 

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