Question
Question: Water falls from a height of 60 m at the ratio of 15 kg/s to operate a turbine. The losses due to fr...
Water falls from a height of 60 m at the ratio 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
8.1 kW
Explanation
Solution
P = dW/dt = d/dt(0.9 mgh)
[∵10% loss of energy]
= (0.9)hg dm/dt
= (0.9) (60) (10)×15 = 8100 watt
= 8.1 kw