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Work Energy and Power question

2008 · Q154
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Work Energy and Power question

2008 · Q154

NEETPhysicsWork Energy and PowerMCQ+4 / −1
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)
  1. A
    12.3 kW
  2. B
    7.0 kW
  3. C
    8.1 kW
  4. D
    10.2 kW
View written solutionFree

Correct answer: C

It is seen that input power to turbine will be the potential energy due to water falling in a second which is equal to

mgh = 15×10×60

= 9000 watt

Now power generated by turbine is 10% less than above value equal to

(9000 – 900) watt = 8100 watt

= 8.1 kW

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