Question

Water falls from a height of `60 m` at the rate `15 kg//s` to operate a turbine. The losses due to frictional forces are `10%` of energy . How much power is generated to by the turbine? (`g=10 m//s^(2))`.
A. `8.1 kW`
B. `10.2 kW`
C. `12.3 kW`
D. `7.0kW`

Answer 1

Correct Answer - A
Here, `h=60m, m=15kg//s`
Loss of energy `=10%, g=10 m//s^(2)`
Power generated `=mgh//t`
`=15xx10xx60=9000wat t`
Useful power`=((100-10))/(100)xx9000`
`=8100 wat t=8.1 kW`