ISRO Mechanical & Aerospace 2018 - Question 27

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Topic: Fluid Mechanics

The hydraulic diameter, Dh of a rectangular channel with sides 'a' and 'b' is,

Figure for question 27, ISRO Mechanical & Aerospace 2018

  • A. Dh = 2ab / (a+b)
  • B. Dh = 4ab / (2a+b)
  • C. Dh = 2ab / (2a+b)
  • D. Dh = 4ab / (a+b)

Answer: A. Dh = 2ab / (a+b)

Explanation: Hydraulic diameter Dh = 4 * Area / Perimeter = 4(ab) / 2(a+b) = 2ab / (a+b).

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