At a hydro electric power plant site, available head and

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At a hydro electric power plant site, available head and flow rate are 24.5 m and 10.1 m³/s respectively. If the turbine to be installed is required to run at 4.0 revolution per second (rps) with an overall efficiency of 90%, the suitable type of turbine for this site is

1. Francis
2. Kaplan
3. Pelton
4. Propeller

Correct Option: A

Given: H = 24.5 m, Q = 10.1 m³ /s
N = 4 rev/s = 4 × 60 = 240 r.p.m.
η₀ = 0.90
∴ Power generated P = ρgQH × 0.9
P = 1000 × 9.81 × 10.1 × 24.5 × 0.9
P = 2184.7 kW
Again ,

N_s =	N√P
	H^{5 / 4}

N_s =	240√2184.7	= 205.80
	(24.5)^{5 / 4}

51 < N_s < 255, hence turbine in Francis.