A) 60%
B) 40%
C) 20%
D) 30%
Correct Answer: D
Solution :
Work done in raising water \[=mgh\] \[\therefore \] W = (volume \[\times \] density) \[gh\] \[=(9\times 1000)\times 10\times 10\] \[\Rightarrow \] \[W=9\times {{10}^{5}}J\] \[\therefore \]Useful power \[=\frac{work}{time}\,=\frac{9\times {{10}^{5}}}{5\times 60}\,=3\,kW\] \[\therefore \]Efficiency \[=\frac{3}{10}\times 100=30%\]You need to login to perform this action.
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