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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

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  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

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  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.

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  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

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  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.

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  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

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  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

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  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.

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  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.

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  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

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