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NEET 2021 · Power

Power question from NEET 2021

Q25NEET 2021Easy

Power

Water falls from a height of 60m 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)

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Answer: (c)

Input power $= \dfrac{m}{t}gh = 15 \times 10 \times 60 = 9000\text{ W}$ .
10% is lost, so output $= 0.9 \times 9000 = 8100\text{ W}$ .
So the answer is (c) $8.1\text{ kW}$ .

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