Railways Technical Ability Turbomachinery Question Bank Turbomachinery

  • question_answer                       Consider the following statements:
    In centrifugal compressors, there is a tendency of increasing surge when
    1. The number of diffuser vanes is less than the number of impeller vanes
    2. The number of diffuser vanes is greater than the number of impeller vanes
    3. The number of diffuser vanes is equal to the number of impeller vanes
    4. Mass flow is greatly in excess of that corresponding to Lbs design mass flow
    Which of these statements is/are correct?

    A) 1 and 4            

    B) 2 alone

    C) 3 and 4

    D) 2 and 1

    Correct Answer: D


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