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Which type of penstock is used in cold climates?

(a) Buried penstock

(b) Covered penstock

(c) Open penstock

(d) Exposed penstock

I got this question in examination.

My doubt stems from Site Selection for Hydro Electric Power Plants in division Hydro Electric Power Plant of Energy Engineering

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Correct option is (a) Buried penstock

Best explanation: Buried penstocks are used in cold climates where freezing is expected. types of penstocks have shorter life period. A buried penstock will not be subjected to the problem of harmonic vibrations sometimes associated with the traditional penstock.

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