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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 .  `(V_1 - V_2)/(V_1)`
B .  `(V_1^2 - V_2^2)/(V_1^2)`
C .  `(V_1)/(V_1 - V_2)`
D .  `(V_1^2)/(V_1^2 - V_2^2)`
Answer: Option B



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