If V1 and V2 are the velocities of water at inlet and outlet of the draft tube r

Question - If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

Options:

A . (V1 - V2) / V1

B . (V1² - V2²) / V1²

C . V1 / (V1 - V2)

D . V1² / (V1² - V2²)

Answer: Option B
Answer: (b).(V1² - V2²) / V1²

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