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Chemical Engineering :: Fluid Mechanics

  1. The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is

  2. A.
    0.1
    B.
    0.55
    C.
    0.95
    D.
    1.85

  3. A conical tank with a bottom opening of cross-sectional area A is filled with water and is mounted on supports as shown in the figure. What is the force F with which plate X must be pushed up to prevent water from leaking ? Assume that the density of air is negligible as compared to the density of water ρL.

  4. A.
    ρL . Vg
    B.
    ρL . A.Hg
    C.
    ρL . Vg/2
    D.
    ρL .Vg/3

  5. A relief valve

  6. A.
    provides back pressure for a cylinder.
    B.
    unloads a pump.
    C.
    is a directional control valve.
    D.
    none of these.

  7. An isentropic process is the one, in which

  8. A.
    pv = constant
    B.
    pvr = constant
    C.
    pvr = constant, and process is reversible
    D.
    none of these

  9. The distribution of shear stress in a stream of fluid in a circular tube is

  10. A.
    linear with radius for turbulent flow only.
    B.
    linear with radius for laminar flow only.
    C.
    linear with radius for both laminar & turbulent flow.
    D.
    parabolic with radius for both laminar & turbulent flow.

  11. For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is

  12. A.
    more
    B.
    less
    C.
    equal
    D.
    more or less, depending on the type of particle

  13. Specific speed of a centrifugal pump relates it with another pump having the

  14. A.
    dynamic similarity
    B.
    same efficiency
    C.
    same speed
    D.
    geometrical similarity

  15. Air vessel fitted to a reciprocating pump

  16. A.
    increases the work done.
    B.
    decreases the work done.
    C.
    causes cavitation.
    D.
    results in non-uniform discharge.

  17. Deformation drag, which is caused by widespread deformation of fluid around the immersed body

  18. A.
    occurs when NRe is very small.
    B.
    is primarily a friction drag.
    C.
    is independent of body length.
    D.
    depends mainly on cross-sectional shape.

  19. In isotropic turbulence, the __________ are equal to each other.

  20. A.
    temporal velocity components
    B.
    mean square of velocity fluctuations in the three co-ordinate directions
    C.
    root mean square of velocity fluctuations in the three co-ordinate directions
    D.
    none of these