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				| 1. | The inner and outer surfaces of a furnace wall, 25 cm thick, are at 300 degree Celsius and 30 degree Celsius. Here thermal conductivity is given by the relationK = (1.45 + 0.5 * 10-5 t2) KJ/m hr deg | 
| A. | nWhere, t is the temperature in degree centigrade. Calculate the heat loss per square meter of the wall surface area? | 
| B. | 1355.3 kJ/m<sup>2</sup> hr | 
| C. | 2345.8 kJ/m<sup>2</sup> hr | 
| D. | 1745.8 kJ/m<sup>2</sup> hr | 
| E. | 7895.9 kJ/m<sup>2</sup> hr | 
| Answer» D. 1745.8 kJ/m<sup>2</sup> hr | |