Question:-
Velocity of air passing through a rectangular duct and a circular duct is same. Which one of the following is the correct expression for the equivalent diameter of the circular duct in respect of a rectangular duct for the same pressure loss per unit length? (a and b are the length and breath of the rectangular duct cross-section)
Option (A)
(a+b)/ab
Option (B)
2ab/(a+b)
Option(C)
2a/(a-b)
Option(D)
2b/(a+b)
Correct Option:
(B)
Question Solution:
Equivalent diameter D = (2ab/(a+b))
question-answer-faq-9469