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Q. |
A sphere of radius 40 cm is lagged to a radius of 50 cm. The temperatures of outer and inner surfaces are 66?C and 235?C respectively. Thermal conductivity of logging per cm thickness is 0.7 kcal/m-hr?C. The rate of heat leakage will be |
A. | 500 kcal/hr |
B. | 1.49 kcal/hr |
C. | 666 kcal/hr |
D. | 298 kcal/hr |
E. | 398 kcal/hr |
Answer» D. 298 kcal/hr |
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