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BVP Medical BVP Medical Solved Paper-2009

  • question_answer
     An electric pump is used to fill an overhead tank of capacity 9 m3 kept at a height of 10 m above the ground. If the pump takes 5 min to fill the tank by consuming 10 kW power the efficiency of the pump should be

    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 \[=\frac{3}{10}\times 100=30%\]


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