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15/09/2021 10:17 am
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Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10 m/s2)
(1) 10.2 kW
(2) 8.1 kW
(3) 12.3 kW
(4) 7.0 kW
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15/09/2021 10:20 am
Correct answer: (2) 8.1 kW
Explanation:
Pin = \(\frac{mgh}{t}\) = \(\frac{15 \times 10 \times 60}{1}\)
= 9000 w
Pout = 90% of Pin
= 8.1 kW