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Railways NTPC (Technical Ability) Turbomachinery Question Bank Turbomachinery

  • question_answer
    A two-stage compressor takes in air at 1.1 bars and, discharges at 20 bars. For maximum efficiency, the intermediate pressure is:                        

    A) 10.55 bars                    

    B) 7.33 bars           

    C) 5.5 bars            

    D) 4.7 bars         

    Correct Answer: D

    Solution :

    \[{{p}_{1}}=\sqrt{{{p}_{1}}{{p}_{2}}}=\sqrt{1.1\times 20}\]= 4.69 = 4.7 bar 


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