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Which type of penstocks is less expensive?(a) Buried penstock(b) Covered penstock(c) Open penstock(d) Exposed penstockI had been asked this question in an interview.This is a very interesting question from Site Selection for Hydro Electric Power Plants topic in division Hydro Electric Power Plant of Energy Engineering

Answer»

Correct CHOICE is (d) Exposed penstock

Explanation: Exposed penstocks are less expensive and have a longer life. Their inspection and maintenance is easier. Penstocks are not covered because exposed PIPES are easily accessible. The WATER flow rate is 2, 4, and 7 m/s in LOW, medium and high head power plants respectively.



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