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A draft tube is essentially required for impulse type turbines.

A draft tube is essentially required for impulse type turbines. Correct Answer False

The entire flow from head race to tail race takes place in a closed system as the water is under pressure. The wheels of the turbine are submerged and water enters all around the periphery of the wheel. A closed conduit or casing like the draft tube is absolutely necessary so as to prevent any access of atmospheric air into the turbine.

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