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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. The specific speed of turbine is defined as the speed of a unit

  2. A.

     Of such a size that it delivers unit discharge at unit head

    B.

     Of such a size that it delivers unit discharge at unit power

    C.

     Of such a size that it requires unit power per unit head

    D.

     Of such a size that it produces unit horse power with unit head


  3. The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)

  4. A.

     0.855 a.√(2gH)

    B.

     1.855 aH.√(2g)

    C.

     1.585 a.√(2gH)

    D.

     5.85 aH.√(2g)


  5. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

  6. A.

     0.5 a. √2gH

    B.

     0.707 a. √2gH

    C.

     0.855 a. √2gH

    D.

     a. √2gH


  7. A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

  8. A.

     Equal to

    B.

     Less than

    C.

     More than

    D.

     None of these


  9. A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.

  10. A.

     Equal to

    B.

     Less than

    C.

     More than

    D.

     None of these


  11. Braking jet in an impulse turbine is used

  12. A.

     To break the jet of water

    B.

     To bring the runner to rest in a short time

    C.

     To change the direction of runner

    D.

     None of these


  13. Rotameter is a device used to measure

  14. A.

     Absolute pressure

    B.

     Velocity of fluid

    C.

     Flow

    D.

     Rotation


  15. In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

  16. A.

     Less than

    B.

     More than

    C.

     Equal to

    D.

     None of these


  17. In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

  18. A.

     Less than

    B.

     More than

    C.

     Equal to

    D.

     None of these


  19. Choose the wrong statement

  20. A.

     Fluids are capable of flowing

    B.

     Fluids conform to the shape of the containing vessels

    C.

     When in equilibrium, fluids cannot sustain tangential forces

    D.

     When in equilibrium, fluids can sustain shear forces