A sphere of radius 40 cm is lagged to a radius of 50 cm. The temperatu – McqOptions

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1.	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» E.

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