Railways Technical Ability Metal Forming, Casting and Cutting Question Bank Metal Casting

  • question_answer In a fluid coupling, the torque transmitted is 50 kN.m, when the speed of the driving and driven shaft is 900 rpm and 720 rpm respectively. The efficiency of the fluid coupling will be:

    A) 20%                             

    B) 25%

    C) 80%                             

    D) 90%.

    Correct Answer: C

    Solution :

    Efficiency of hydraulic coupling \[\cos \alpha =\frac{1}{2},\] \[\alpha =60{}^\circ \] \[\frac{{{N}_{2}}}{{{N}_{2}}}=\frac{720}{900}=0.8\,\,or\,\,80%\]


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