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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The unit speed of the turbine runner is

  2. A.

     N/√H

    B.

     N/H

    C.

     N/H3/2

    D.

     N/H²


  3. The speed of a turbine runner is

  4. A.

     Directly proportional to H1/2

    B.

     Inversely proportional to H1/2

    C.

     Directly proportional to H3/2

    D.

     Inversely proportional to H3/2


  5. The shear stress between the two liquid layers is __________ proportional to the distance between two layers.

  6. A.

     Directly

    B.

     Inversely

    C.

     Both A and B

    D.

     None of these


  7. According to fan laws, at constant pressure, the speed capacity and power vary

  8. A.

     Directly as the air or gas density

    B.

     Inversely as square root of density

    C.

     Inversely as density

    D.

     As square of density


  9. The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Cross-sectional area of jet in m², and V = Velocity of jet in m/s)

  10. A.

     waV / 2g

    B.

     waV / g

    C.

     waV² / 2g

    D.

     waV² / g


  11. When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.

  12. A.

     Less than

    B.

     More than

    C.

     Equal to

    D.

     None of these


  13. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

  14. A.

     Ratio of inertial force to force due to viscosity

    B.

     Ratio of inertial force to force due to gravitation

    C.

     Ratio of inertial force to force due to surface tension

    D.

     All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity


  15. Low specific speed of a pump implies it is

  16. A.

     Centrifugal pump

    B.

     Mixed flow pump

    C.

     Axial flow pump

    D.

     None of the above


  17. Medium specific speed of a pump implies it is

  18. A.

     Centrifugal pump

    B.

     Mixed flow pump

    C.

     Axial flow pump

    D.

     Any one of the above


  19. High specific speed of a pump implies it is

  20. A.

     Centrifugal pump

    B.

     Mixed flow pump

    C.

     Axial flow pump

    D.

     Any one of the above