The Left Face of a One Dimensional Slab of Thickness

question 60

Multiple Choice

The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m² .K. At steady state, the temperature of the right face in °C is

• A)77.2
• B)71.2
• C)63.8
• D)48.7

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