A Slab of Insulation Is Made of Three Layers, as Drawing

question 37

Multiple Choice

A slab of insulation is made of three layers, as Drawing I indicates. Each of the layers A, B, and C has the same thickness, but a different thermal conductivity. Heat flows through the slab, and the temperatures are as shown. What are the temperatures T₁ and T₂ in Drawing II where the layers are arranged in a different order?

• A)T₁ = 230 °C and T₂ = 170 °C
• B)T₁ = 200 °C and T₂ = 180 °C
• C)T₁ = 220 °C and T₂ = 160 °C
• D)T₁ = 180 °C and T₂ = 160 °C
• E)T₁ = 210 °C and T₂ = 190 °C

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