The equivalent diameter D of a circular duct corresponding to a rectangular duct having longer side ?a? and shorter side ?b? the same velocity and pressure drop is given by:

The equivalent diameter D of a circular duct corresponding to a rectan

1.	The equivalent diameter D of a circular duct corresponding to a rectangular duct having longer side ?a? and shorter side ?b? the same velocity and pressure drop is given by:
A.	\[D=\frac{a+b}{ab}\]
B.	\[D=\frac{ab}{a+b}\]
C.	\[D=\frac{(a+b)}{2ab}\]
D.	\[D=\frac{2ab}{a+b}\]
Answer» E.

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The equivalent diameter D of a circular duct corresponding to a rectangular duct having longer side ?a? and shorter side ?b? the same velocity and pressure drop is given by:

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