Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer Consider the following coefficients:
    (Re = Reynold number)
    1. \[1.328\,\,{{\operatorname{Re}}^{-\,\left( 0.5 \right)}}\] for laminar flow
    2. \[0.72\,\,{{\operatorname{Re}}^{-\,\left( 0.2 \right)}}\] for turbulent flow
    3. \[0.072\,\,{{\operatorname{Re}}^{-\,\left( 0.2 \right)}}\] for turbulent flow
    4. \[1.028\,\,{{\operatorname{Re}}^{-\,\left( 0.5 \right)}}\] for laminar flow.
    The Coefficients for drag for a flat plate would include:

    A) 1 and 2            

    B) 2 and 4

    C) 1 and 3            

    D) 3 and 4

    Correct Answer: C


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