Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer Which one of the following expresses the error in discharge due to error in the measurement of head over a triangular notch?

    A) \[\frac{dQ}{Q}=\frac{5dH}{2H}\]                     

    B) \[\frac{dQ}{Q}=\frac{3dH}{2H}\]

    C) \[\frac{dQ}{Q}=\frac{7dH}{2H}\]                     

    D) \[\frac{dQ}{Q}=\frac{1dH}{2H}\]

    Correct Answer: A

    Solution :

    For a triangular notch. \[Q\propto {{H}^{5/2}}\] \[In\,Q=\frac{5}{2}\,In\,H\] \[\frac{dQ}{Q}=\frac{5}{2}=\frac{dH}{H}\]

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