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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. If the depth of water in an open channel is greater than the critical depth, the flow is called

  2. A.

     Critical flow

    B.

     Turbulent flow

    C.

     Tranquil flow

    D.

     Torrential flow


  3. When the Mach number is more than 6, the flow is called

  4. A.

     Sub-sonic flow

    B.

     Sonic flow

    C.

     Super-sonic flow

    D.

     Hyper-sonic flow


  5. When the Mach number is less than unity, the flow is called

  6. A.

     Sub-sonic flow

    B.

     Sonic flow

    C.

     Super-sonic flow

    D.

     Hyper-sonic flow


  7. The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.

  8. A.

     Decreases

    B.

     Increases

    C.

     Remain same

    D.

     None of these


  9. The power produced by the reaction turbine is ________ to the head of water.

  10. A.

     Directly proportional

    B.

     Inversely proportional

    C.

     4th power

    D.

     None of these


  11. For a body floating in a liquid the normal pressure exerted by the liquid acts at

  12. A.

     Bottom surface of the body

    B.

     C.G. of the body

    C.

     Metacenter

    D.

     All points on the surface of the body


  13. For hypersonic flow, the Mach number is

  14. A.

     Unity

    B.

     Greater than unity

    C.

     Greater than 2

    D.

     Greater than 4


  15. A flow is called hyper-sonic, if the Mach number is

  16. A.

     Less than unity

    B.

     Unity

    C.

     Between 1 and 6

    D.

     None of these


  17. A flow is called sub-sonic, if the Mach number is

  18. A.

     Less than unity

    B.

     Unity

    C.

     Between 1 and 6

    D.

     More than 6


  19. Metacentric height is the distance between the metacentre and

  20. A.

     Water surface

    B.

     Center of pressure

    C.

     Center of gravity

    D.

     Center of buoyancy