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Pick the correct choice of turbine required to generate 10,000 HP under a head of 81 m while working at a speed of 500 rpm.

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in Irrigation Engineering by (75.2k points)
Pick the correct choice of turbine required to generate 10,000 HP under a head of 81 m while working at a speed of 500 rpm.

(a) Pelton

(b) Kaplan

(c) Bulb

(d) Francis

This question was addressed to me by my college director while I was bunking the class.

Question is taken from Hydro Electric Power topic in chapter Hydro Electric Power of Irrigation Engineering

1 Answer

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by (106k points)
Right option is (d) Francis

Best explanation: The specific speed is given by the equation: Ns = N. Pt^1/2 / H^5/4

Where, N = the normal speed of turbine = 500 rpm

Pt = Turbine output in metric horsepower = 10,000 hp

H = effective head = 81 m

Ns = 500 x 100 / 81^5/4 = 205.76 rpm.

The turbine which is suitable for a head between 25 to 150 m and Ns of 60 – 300 is Francis turbine i.e reaction type turbine.

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