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31. | One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to | |
A. | 800K | |
B. | 1000K | |
C. | 1200K | |
D. | 1400K | |