Railways Technical Ability Turbomachinery Question Bank Turbomachinery

  • question_answer At the eye tip of a centrifugal impeller, blade velocity is 200 m/s while the uniform axial velocity at the inlet is 150 m/s. If the sonic velocity is 300 m/s, then the inlet Mach number of the flow will be:

    A) 0.50                             

    B) 0.66

    C) 0.83                             

    D) 0.87

    Correct Answer: C

    Solution :

    Mach number, \[M=\frac{axial\,\,velocity\,\,at\,\,inlet}{sonic\,\,velocity}\] \[=\frac{150}{300}=0.5\]

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