📊 Fluid Mechanics
Q. The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is
  • (A) Ro - Ri
  • (B) 2(Ro - Ri)
  • (C) 4(Ro - Ri)
  • (D) 8(Ro - Ri)
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✅ Correct Answer: (B) 2(Ro - Ri)

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