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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 is to be tested for estimating the wave drag. If the speed of the ship is 1 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 :

    \[{{v}_{p}}={{v}_{m}}\,\sqrt{\frac{{{l}_{p}}}{{{l}_{m}}}}\] \[1={{v}_{m}}\,\sqrt{25}=5{{v}_{m}}\] \[{{v}_{m}}=\frac{1}{5}=0.2\,\,\text{m/s}\]


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