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Question
In a reaction turbine, the draft tube is used
Options:
A .  to run the turbine full
B .  to prevent air to enter the turbine
C .  to increase the head of water by an amount equal to the height of the runner outlet above the tail race
D .  to transport water to downstream
Answer: Option C
Answer: (c).to increase the head of water by an amount equal to the height of the runner outlet above the tail race

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