ISRO Mechanical & Aerospace 2018 - Question 30

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Topic: Heat Transfer

The value of Biot number is very small (<0.01) when

  • A. conductive resistance of the fluid is negligible
  • B. conductive resistance within the body is negligible
  • C. conductive resistance of the fluid surface of the body is negligible
  • D. None of these

Answer: B. conductive resistance within the body is negligible

Explanation: The value of Biot number is very small when the conductive resistance within the body is negligible (meaning its internal conductivity approaches infinity).

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