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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
  • Correct Answer - Option(D)
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  • Filed under category Heat Transfer
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