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| वक्र | प्रक्रिया |
| $I$ | $a)$ रुद्धोष्म (Adiabatic) |
| $II$ | $b)$ समदाबी (Isobaric) |
| $III$ | $c)$ समआयतनिक (Isochoric) |
| $IV$ | $d)$ समतापीय (Isothermal) |
| स्तंभ-$I$ | स्तंभ-$II$ |
|---|---|
| $(a)$ हीट इंजन | $(i)$ $\eta = \frac{Q_2}{Q_1 - Q_2}$ |
| $(b)$ हीट पंप | $(ii)$ $\eta = \frac{Q_1 - Q_2}{Q_1}$ |
| $(iii)$ $\eta = \frac{T_1 - T_2}{T_1}$ |
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