Civil Engineering MCQJE Level Civil Engineering
The head loss in a pipe due to friction (Darcy-Weisbach equation) is:
Fluid MechanicsFluid MechanicsMEDIUM
Choose the correct answer
A
hf = fLV/D
B
hf = fLV²/(2gD)
C
hf = fD/(LV²)
D
hf = fLV²/D
Correct Answer
B. hf = fLV²/(2gD)
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hf = fLV²/(2gD) where f = Darcy friction factor (dimensionless), L = pipe length, V = velocity, D = diameter, g = gravity. For laminar flow: f = 64/Re. For turbulent flow: f from Moody chart. Colebrook-White equation gives f for rough pipes. Also written hf = fLQ²/(12.1 D⁵) using flow rate Q.
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