The hydraulic diameter of an annulus of inner and outer radii Ri and R

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

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The hydraulic diameter of an annulus of inner and outer radii Ri and Ro respectively is

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