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