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| કોલમ-$I$ | કોલમ-$II$ |
|---|---|
| $(a)$ હીટ એન્જિન | $(i)$ $\text{COP} = \frac{Q_2}{Q_1 - Q_2}$ |
| $(b)$ હીટ પંપ | $(ii)$ $\eta = \frac{Q_1 - Q_2}{Q_1}$ |
| $(iii)$ $\eta = \frac{T_1 - T_2}{T_1}$ |
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