Railways Technical Ability Turbomachinery Question Bank Turbomachinery

  • question_answer In a De Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure as the minimum cross-section will be:

    A) 3.3 bar             

    B) 5.46 bar

    C) 8.2 bar             

    D) 9.9 bar

    Correct Answer: B

    Solution :

    Throat pressure, \[{{p}_{2}}={{p}_{1}}{{p}_{1}}{{\left[ \frac{2}{n+1} \right]}^{\frac{n}{n-1}}}\] \[=10{{\left[ \frac{2}{2.3} \right]}^{\frac{13}{0.3}}}=5.46\,\,bar\]

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