Railways Technical Ability Refrigeration and Air-Conditioning Question Bank Refrigeration and Air-Conditioning

  • question_answer The equivalent diameter D of a circular duct corresponding to a rectangular duct having longer side ?a? and shorter side ?b? the same velocity and pressure drop is given by:

    A) \[D=\frac{a+b}{ab}\]               

    B) \[D=\frac{ab}{a+b}\]

    C) \[D=\frac{(a+b)}{2ab}\]           

    D) \[D=\frac{2ab}{a+b}\]

    Correct Answer: D


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