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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