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What is used to prevent the entry of debris into turbine?

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What is used to prevent the entry of debris into turbine?

(a) Wiper

(b) Fore bay

(c) Trash rack

(d) Filter

This question was addressed to me by my school teacher while I was bunking the class.

The above asked question is from Site Selection for Hydro Electric Power Plants topic in division Hydro Electric Power Plant of Energy Engineering

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Right choice is (c) Trash rack

The explanation: Trash rack is used to prevent the entry of debris which might damage the Wicket gate and turbine. It is a wooden or metal structure and is supported by masonry, that prevents waterborne debris from entering into penstock which than connects to turbine.

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