Q55 / 71 · NEST (NISER) 2015 · Physics
A Carnot engine is made to operate as a refrigerator. This refrigerator is used to freeze water at $0^{\circ} \mathrm{C}$ to ice at $0^{\circ} \mathrm{C}$ and the heat from the working substance is discharged into a large tank containing water at $34^{\circ} \mathrm{C}$. The latent heat of fusion of ice is $334 \times 10^3 \mathrm{~J} / \mathrm{kg}$. The minimum amount of work required to freeze 3 kg of water is close to
- A$83 \times 10^3 \mathrm{~J}$
- Correct answerB$125 \times 10^3 \mathrm{~J}$
- C$94 \times 10^3 \mathrm{~J}$
- D$147 \times 10^3 \mathrm{~J}$
Hence, the correct answer is option: 'B'.