ISRO Scientist or Engineer Mechanical 2010 Question 9

Question 9

The heat flow rate through parallel walls of thickness $$L_1, L_2, and L_3$$ and having surface areas $$A_1, A_2, and A_3$$, thermal conductivities $$k_1, k_2, and k_3,$$ respectively and first and last walls maintained at temperatures $$t_1 and t_2$$ will be



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