Question

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine ? (g = 10 m/s²)

(a) 12.3 kW 

(b) 7.0 kw

(c) 8.1 kw

(d) 10.2 kw

Answer 1

Correct option (c) 8.1 kw

Explanation:

Mass of water falling/second = 15 kg/s h = 60 m, g = 10 m/s², loss = 10 % i.e., 90% is used. Power generated = 15 x 10 x 60 x 0.9 = 8100 W = 8.1 kW.