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Railways NTPC (Technical Ability) Fluid Mechanics and Machinery Question Bank Fluid Mechanics

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                     What is the percentage error in the estimation of the discharge due to an error of 2% in the measurement of the reading of a differential manometer connected to an orifice meter? 

    A) 4                                 

    B) 3

    C) 2                                 

    D) 1     

    Correct Answer: D

    Solution :

    For an orificemeter \[Q\propto \sqrt{H}\] or \[Q=K\sqrt{H},\] Where, K = a constant In \[Q=In\,K+\frac{1}{2}\,In\,H\] \[\frac{dQ}{Q}=0+\frac{1}{2},\] \[\frac{dH}{H}=\frac{1}{2}\times 2=1%\]  


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