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

  • question_answer
    A \[\frac{1}{25}\] model of a ship it to be tested for estimating the wave drag. If the speed of the prototype is 1.0 m/s, then the speed at which the model must be tested is:

    A) 0.04 m/s                       

    B) 0.2 m/s

    C) 5.0 m/s             

    D) 25.0 m/s

    Correct Answer: B

    Solution :

    \[\frac{{{v}_{m}}}{{{v}_{p}}}=\sqrt{\frac{{{1}_{m}}}{{{1}_{p}}}},\] \[{{v}_{m}}=1.0\,\sqrt{\frac{1}{25}}=0.2\,\text{m/s}\]


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