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Chemical Engineering :: Fluid Mechanics

  1. The capillary rise of mercury is maximum in glass tube of dia __________ mm.

  2. A.

     0.5

    B.

     1

    C.

     2

    D.

     5


  3. The pitot static tube does not measure the __________ pressure.

  4. A.

     Static

    B.

     Total

    C.

     Difference in static & dynamic

    D.

     All of the above


  5. Manometers measure the __________ pressure.

  6. A.

     Vacuum as well as the atmospheric

    B.

     Difference in

    C.

     Absolute

    D.

     Gage


  7. Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft.

  8. A.

     40

    B.

     34

    C.

     8

    D.

     37


  9. At high Reynolds number

  10. A.

     Inertial forces control and viscous forces are unimportant

    B.

     Viscous forces predominate

    C.

     Inertial forces are unimportant and viscous forces control

    D.

     None of these


  11. At low Reynolds number

  12. A.

     Viscous forces are unimportant

    B.

     Viscous forces control

    C.

     Viscous forces control and inertial forces are unimportant

    D.

     Gravity forces control


  13. Viscosity of water is about __________ times that of air at room temperature.

  14. A.

     15

    B.

     55

    C.

     155

    D.

     1050


  15. The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the

  16. A.

     Barometric pressure

    B.

     Speed of the impeller

    C.

     Diameter of the impeller

    D.

     Both B and C


  17. Euler's equation of motion states, that at every point, the

  18. A.

     Fluid momentum is constant

    B.

     Force per unit mass equals acceleration

    C.

     Rate of mass outflow is equal to the rate of mass inflow

    D.

     None of these


  19. The buoyant force acting on a floating body is dependent on the

  20. A.

     Viscosity of the liquid

    B.

     Weight of the liquid displaced

    C.

     Depth of immersion of the body

    D.

     Surface tension of the liquid