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 A furnace wall is constructed as shown in the figure below. That heat transfer coefficient across the outer casing will be                                                                                                                                    (IES-99) 

                                                                                                   

(a)80 W/m2K              (b) 40 W/m2K

(c) 20 W/m2K             (d) 10 W/m2K

                                            

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