Railways Technical Ability Turbomachinery Question Bank Turbomachinery

  • question_answer              Given: \[{{v}_{w\,2}}=\] velocity of whirl at outlet         
    \[{{u}_{2}}=\]Peripheral velocity of the blade tips        
    The degree of reaction in a centrifugal compressor equal to:                                    

    A) \[1-\frac{{{v}_{w\,2}}}{2{{u}_{2}}}\]              

    B) \[1-\frac{{{u}_{2}}}{2{{v}_{w\,2}}}\]

    C) \[1-\frac{2{{v}_{w\,2}}}{{{u}_{2}}}\]              

    D) \[1-\frac{{{v}_{w\,2}}}{{{u}_{2}}}\]

    Correct Answer: B


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