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GATE XE 2025 | Question: 93

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​​​​​Let $T_{H}$ and $T_{L}$ denote the absolute temperatures of high and low temperature reservoirs, respectively. The coefficient of performance of a reversible refrigerator operating between these two reservoirs is

  1. $\frac{1}{\frac{T_{H}}{T_{L}}-1}$
  2. $\frac{1}{1-\frac{T_{H}}{T_{L}}}$
  3. $\frac{1}{\frac{T_{L}}{T_{H}}-1}$
  4. $\frac{1}{\frac{T_{L}}{T_{H}}+1}$

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