A furnace wall made of steel plate 10 mm thick and thermal conductivity 15 kcal/m-hr-°C is lined inside with silica brick of 150 mm thick of thermal conductivity 1.75 kcal/m-hr-°C and on outside with magnesia bricks of 200 mm thick with thermal conductivity of 4.5 kcal/m-hr-°C. The total resistance of the composite wall will be

A furnace wall made of steel plate 10 mm thick and thermal conductivit

1.	A furnace wall made of steel plate 10 mm thick and thermal conductivity 15 kcal/m-hr-°C is lined inside with silica brick of 150 mm thick of thermal conductivity 1.75 kcal/m-hr-°C and on outside with magnesia bricks of 200 mm thick with thermal conductivity of 4.5 kcal/m-hr-°C. The total resistance of the composite wall will be
A.	0.13 °C-hr/kcal
B.	0.23 °C-hr/kcal
C.	0.03 °C-hr/kcal
D.	0.33 °C-hr/kcal
Answer» B. 0.23 °C-hr/kcal

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