Railways Technical Ability Turbomachinery Question Bank Turbomachinery

  • question_answer If the stream function is given by \[\psi =3xy,\] then the velocity at a point (2, 3) will be:

    A) 7.21 unit                       

    B) 10.82 unit

    C) 18 unit             

    D) 54 unit

    Correct Answer: B

    Solution :

    \[\psi =3xy\] \[u=\frac{\delta \psi }{\delta y}=3x,\] \[v-\frac{\delta \psi }{\partial }=-\,3y\] Resultant velocity, \[v=\sqrt{{{u}^{2}}+{{v}^{2}}}=\sqrt{9{{x}^{2}}+9{{y}^{2}}}\]

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