Home / Mechanical Engineering / Hydraulics and Fluid Mechanics :: section-5

Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)

  2. A.

     4wd/σ cosα

    B.

     σ cosα/4wd

    C.

     4σ cosα/wd

    D.

     wd/4σ cosα

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. The viscosity of water is __________ than that of mercury.

  4. A.

     Higher

    B.

     Lower

    C.

     Same as

    D.

     None of these

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. The surface tension of mercury at normal temperature compared to that of water is

  6. A.

     More

    B.

     Less

    C.

     Same

    D.

     More or less depending on size of glass tube

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

  8. A.

     Slow speed with radial flow at outlet

    B.

     Medium speed with radial flow at outlet

    C.

     High speed with radial flow at outlet

    D.

     High speed with axial flow at outlet

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if

  10. A.

     The area is horizontal

    B.

     The area is vertical

    C.

     The area is inclined

    D.

     All of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. In a centrifugal pump casing, the flow of water leaving the impeller, is

  12. A.

     Rectilinear flow

    B.

     Radial flow

    C.

     Free vortex motion

    D.

     Forced vortex

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity

  14. A.

     One-half

    B.

     One-third

    C.

     Two-third

    D.

     Three-fourth

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. Operation of McLeod gauge used for low pressure measurement is based on the principle of

  16. A.

     Gas law

    B.

     Boyle's law

    C.

     Charles law

    D.

     Pascal's law

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. The flow ratio of Francis turbine is defined as the ratio of the

  18. A.

     Velocity of flow at inlet to the theoretical jet velocity

    B.

     Theoretical velocity of jet to the velocity of flow at inlet

    C.

     Velocity of runner at inlet to the velocity of flow at inlet

    D.

     None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. The jet ratio is defined as the ratio of the

  20. A.

     Diameter of jet to the diameter of Pelton wheel

    B.

     Velocity of jet to the velocity of Pelton wheel

    C.

     Diameter of Pelton wheel to the diameter of jet

    D.

     Velocity of Pelton wheel to the velocity of jet

    View Answer

    Workspace

    Discuss Discuss in Forum