NEC Civil · 2081 · Question 76

If $$\mathbf{V}\_1$$ and $$\mathbf{V}\_2$$ are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

GitBook practice — Set 10 (Chaitra, 2081)

A$$(\mathbf{V}\_1 - \mathbf{V}\_2) / (\mathbf{V}\_1)$$

B$$(\mathbf{V}\_1^2 - \mathbf{V}\_2^2) / (\mathbf{V}\_1^2)$$

C$$(\mathbf{V}\_1^2) / (\mathbf{V}\_1^2 - \mathbf{V}\_2^2)$$

D$$(\mathbf{V}\_1) / (\mathbf{V}\_1 - \mathbf{V}\_2)$$

Checking answer access…