Question

Water falls from a height of 50 m at the rate of 20 kg/s to operate a turbine. The losses due to frictional forces are 20% of energy incident on the turbine. The power generated by the turbine is (g = $10 \,ms^{-2}$)

• A. 10 kW
• B. 12 kW
• C. 8 kW
• D. 9 kW
• E. $P_{out} = \eta \frac{W}{t}=\eta\frac{m}{t}gh$
  = $0.8 \times 20 \times 10 \times 50$
  = $8000 \,W$ $P_{out} \,=\, 8 \,kW$

Answer 1

Answer: (C)

Correct answer is (c) 8 kW