Railways Technical Ability Turbomachinery Question Bank Turbomachinery

  • question_answer In an axial flow co impresser stage, air enters and leaves the stage axially. If the whirl component of the air leaving the rotor is half the mean peripheral velocity of the rotor Wades, then the degree of reaction will be:

    A) 1.00                             

    B) 0.75

    C) 0.50                             

    D) 0.25

    Correct Answer: D

    Solution :

    \[{{R}_{d}}=\frac{{{v}_{f}}}{2u}(tan{{\beta }_{1}}+tan{{\beta }_{2}})\] \[\frac{{{v}_{f}}}{u}=\frac{1}{2},\] \[tan{{\beta }_{1}}=\tan {{\beta }_{2}}=\frac{1}{2}\] \[\frac{{{v}_{f}}}{u}=\frac{1}{2},\] \[tan{{\beta }_{1}}=\tan {{\beta }_{2}}=\frac{1}{2}\] \[{{R}_{d}}=\frac{1}{4}\,\,\left( \frac{1}{2}+\frac{1}{2} \right)=0.25\]

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