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Chemical Engineering :: Fluid Mechanics

  1. A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below :
    Δ P/L = 375 x 103 VOM + 10.94 x 106 V2OM (SI units)
    If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?

  2. A.
    0.2
    B.
    0.5
    C.
    0.7
    D.
    0.8

  3. Dimension of kinematic viscosity is

  4. A.
    MLT-1
    B.
    L2 . T-1
    C.
    L2T
    D.
    L2 . T-2

  5. A streamline is a line in flow field,

  6. A.
    that is traced by all the fluid particles passing through a given point.
    B.
    along which a fluid particle travels.
    C.
    such that at every point on it, the velocity is tangential to it.
    D.
    none of these.

  7. While starting an axial flow pump, its delivery valve should be kept

  8. A.
    open
    B.
    closed
    C.
    either open or closed
    D.
    none of these

  9. __________ forces do not act in case of fluid flow.

  10. A.
    Elastic
    B.
    Tensile
    C.
    Vibratory
    D.
    Centrifugal

  11. Non-colloidal solution is an example of the __________ fluid.

  12. A.
    non-Newtonion
    B.
    Newtonion
    C.
    dilatent
    D.
    pseudoplastic

  13. Boundary layer separation is caused by the

  14. A.
    reduction of pressure below vapour pressure.
    B.
    reduction of pressure gradient to zero.
    C.
    adverse pressure gradient.
    D.
    reduction of boundary layer thickness to zero.

  15. Identification of pipelines carrying different liquids and gases is done by the __________ of the pipe.

  16. A.
    diameter
    B.
    colour
    C.
    altitude
    D.
    none of these

  17. Pick out the correct statement.

  18. A.
    Human blood is a Newtonion fluid.
    B.
    A Newtonion fluid obeys Newton's law of cooling.
    C.
    For a non-Newtonion fluid, a straight line passes through the origin in a plot between shear stress and shear gradient.
    D.
    Thin lubricating oil is an example of a non-Newtonion fluid.

  19. What is the unit of kinematic viscosity in SI unit ?

  20. A.
    M2/sec
    B.
    N/m2 . sec
    C.
    Kg . sec/m
    D.
    None of these