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Railways NTPC (Technical Ability) Theory of Machines and Machine Design Question Bank Theory of Machines

  • question_answer
        Flow takes place at Reynolds number of 1500 in two different pipes with relative roughness of 0001 and 0002. The friction factor:                

    A) Will be higher in case of pipe with relative roughness of 0001                         

    B) Will be higher in case of pipe with relative ness of 0.002                        

    C) Will be same in both pipes           

    D) In the two pipes cannot be compared on the basis of data given 

    Correct Answer: C

    Solution :

    Re = 1500, Frication factor for a pipe. \[f=\frac{64}{\operatorname{Re}}.\,\,\,Hance\,\,{{F}_{1}}={{F}_{2}}\]


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