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Railways NTPC (Technical Ability) Instrument Mechanical Question Bank Instrument Mechanical

  • question_answer
    A centrifugal pump delivers water at the rate of 50 litres/s against a total head of 40 metres. Then the Power required to drive the pump is:

    A) 2 k W               

    B) 15.2 k W

    C) 19.6 k W                      

    D) 25.8 k W

    Correct Answer: C

    Solution :

    \[Q=50\times {{10}^{-3}}\,{{m}^{3}}/s,\] H=40 m \[Q=50\times {{10}^{-\,3}}\,{{m}^{-\,3}}/s,\] H=40 m \[P=\frac{\gamma QH}{{{10}^{3}}}=\frac{9-81\times {{10}^{3}}\times 50\times {{10}^{-3}}\times 40}{{{10}^{3}}}\]             = 19.62 km


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