Water falls from a height of 60 m at the rate of 15 kg s - 1 to operate a turbine. The losses due to…

Water falls from a height of 60 m at the rate of 15 kg s-1 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 s-2)
  1. 10.2 kW
  2. 12.3 kW
  3. 8.1 kW
  4. 7.0 kW

Solution

Change in potential energy of water per second =15×g×60

=9000 J s-1

Energy remaining per second after loss =90% of 9000 J s-1

=90100×9000

=8100 J s-1

=8.1 kW

Asked in: NEET 2021

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