The hydraulic diameter of an annulus of inner and outer radii Rᵢ and – McqOptions

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1.	The hydraulic diameter of an annulus of inner and outer radii Rᵢ and R₀ respectively is
A.	4(R₀-Rᵢ)
B.	√(R₀-Rᵢ)
C.	2(R₀-Rᵢ)
D.	R₀ + Rᵢ
Answer» D. R₀ + Rᵢ

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