A) 8.1 k W
B) 10.2 kW
C) 12.3 k W
D) 7.0 kW
Correct Answer: A
Solution :
[a] Given, \[\operatorname{h}= 60m, g= 10m{{s}^{-2}},\] Rate of flow of water = 15 kg/s \[\therefore \] Power of the falling water \[=15kg{{s}^{-1}}\times 10m{{s}^{-2}}\times 60m=900watt.\] Loss in energy due to friction \[= 9000\times \frac{10}{100}= 900 watt.\] \[\therefore \] Power generated by the turbine \[=(9000-900)watt=8100\text{ }watt=8.1\text{ }kW\]
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