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A working fluid goes through a Carnot cycle of operations, the upper absolute temperature of the fluid being q1 and the lower absolute temperature being q2. The amount of heat taken in and rejected by the working fluid are Q1 and Q2 respectively. On account of losses of heat due to conduction etc., the heat source temperature T1 is higher than  and the heat sink temperature T2 is lower than Q2. If T1 = (q1 + KQ1) ; T2 = (q2  – KQ2) where K is the same constant for both the equations, show that the efficiency of the plant is given by 

                                                ${\color{Blue} \eta =1- \frac{T_2}{T_1-K Q_2}}$

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