Civil Engineering MCQAE Level Civil Engineering
For flow through a small orifice at the base of a large tank with head H above the orifice centre, the theoretical velocity of efflux is:
Fluid MechanicsTorricelli TheoremMEDIUM
Choose the correct answer
A
V = gH
B
V = sqrt(2gH)
C
V = 2sqrt(gH)
D
V = sqrt(gH/2)
Correct Answer
B. V = sqrt(2gH)
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Torricelli theorem (Bernoulli between free surface and orifice, with kinetic energy at surface = 0): V = sqrt(2gH). Actual velocity = Cv x sqrt(2gH) where Cv is the coefficient of velocity.
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