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

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

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