Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer   Which one of the following is the continuity equation in differential form?                             (The symbols have usual meanings)

    A) \[\frac{dA}{A}+\frac{dV}{V}+\frac{d\rho }{\rho }=\text{constant}\]

    B) \[\frac{dA}{A}+\frac{dV}{V}+\frac{d\rho }{\rho }=0\]

    C) \[\frac{A}{dA}+\frac{V}{dV}+\frac{\rho }{d\rho }=\text{constant}\]

    D) \[AdA+VdA+\rho d\rho =0\]

    Correct Answer: B


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