Hydraulic diameter for non-circular ducts is equal to ___________ times the area of flow divided by the perimeter?
Correct answer: C. Four
- A. Two
- B. Three
- C. Four
- D. Eight
Explanation
The hydraulic diameter is defined as D_h = 4A/P, where A is the flow area and P is the wetted perimeter. The factor is four, not two, because the expression matches a circular pipe diameter.
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