Railways Technical Ability Metal Forming, Casting and Cutting Question Bank Metal Casting

  • question_answer   A centrifugal blower delivering \[\text{Q}{{\text{m}}^{\text{3}}}\text{/s}\] against a head of H m is driven at half the original speed. The new head and discharge would be:

    A) \[H\,and\,Q/2\]              

    B) \[\frac{H}{4}\,and\,\frac{Q}{2}\]

    C) \[\frac{H}{2}\,and\,\frac{Q}{8}\]                       

    D) \[H\,and\,\frac{Q}{4}\] 

    Correct Answer: B

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