Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer A pipe friction test shows that, over the range of speeds used for the test, the non-dimensional friction factor \['f'\] varies inversely with Reynolds Number. From this, one can conclude that the:

    A) Fluid must be compressible

    B) Fluid must be ideal

    C) Pipe must be smooth

    D) Flow must be laminar

    Correct Answer: C

    Solution :

    If \[f\,\alpha \,\frac{1}{\operatorname{Re}},\] then the pipe must be smooth.

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