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Questions  

For which combination of working temperatures of source and sink, the efficiency of Carnot's heat engine is maximum? 

a
600 K, 400 K
b
400 K, 200 K
c
500 K, 300 K
d
300 K, 100 K

detailed solution

Correct option is D

The efficiency of Carnot's heat engine,  η=T1−T2T1For given combinatlons  η1=13, η2=12,η3=25,η4=23So, it is maximum for  T1=300K and T2=100K

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