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The face temperatures of a flat wall are 650?C and 450?C respectively and the thermal conductivity of wall material is 0.30 kcal/m-hr-?C. For a wall thickness of 20 cm, the rate of heat conduction per square meter of wall area will be

[A].	150 kcal/hr	[B].	300 kcal/hr
[C].	600 kcal/hr	[D].	3000 kcal/hr

Answer: Option B

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