For a duct of rectangular cross-section with length l and breadth b, t – McqOptions

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1.	For a duct of rectangular cross-section with length l and breadth b, the value of d e i?
A.	l b / l + b
B.	2 l b
C.	2 l b / l + b
D.	4 l b / l + b
Answer» D. 4 l b / l + b

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