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A draft tube is essentially required for impulse...

A draft tube is essentially required for impulse type turbines.

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asked Nov 9, 2023 in Irrigation Engineering by Carter (75.2k points)

A draft tube is essentially required for impulse type turbines.

(a) True

(b) False

I have been asked this question during an interview.

The origin of the question is Hydro Electric Power topic in portion Hydro Electric Power of Irrigation Engineering

irrigation engineering
hydro electric power

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1 Answer

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answered Nov 16, 2023 by Greg (106k points)

Correct option is (b) False

The explanation is: 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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