engineering recuitment Cochin Shipyard Executive Trainee Mechanical Mock Test Heat Transfer Conduction Heat Conduction Through Plane and Composite Walls
A furnace is provide with an insulating refractory lining. The overall thermal conductivity of the material is 0.03 W/ m K. The thickness of the lining is 100 mm. The inner and outer temperatures are 250°C and 50°C, respectively. The heat loss per unit area to the surroundings will be
1
30 J/m2/s
2
60 J/m2/s
3
60 J/s
4
30 J/s