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Chemical Engineering :: Fluid Mechanics

  1. If Blausius or Darcey friction factor is 'f1' then the Fanning friction factor is equal to

  2. A.
    f1/4
    B.
    4f2
    C.
    2f1
    D.
    f1/2

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  3. Pick out the wrong statement pertaining to fluid flow.

  4. A.
    The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5.
    B.
    The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe.
    C.
    Navier-Stokes equation is applicable to the analysis of viscous flows.
    D.
    Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids.

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  5. A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to

  6. A.
    L ρv2/D
    B.
    L μ;V/D2
    C.
    D ρv2/L
    D.
    μ V/L

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  7. While starting a centrifugal pump, its delivery valve should be kept

  8. A.
    opened.
    B.
    closed.
    C.
    either opened or closed ; it does not make any difference.
    D.
    either opened or closed; depending on the fluid viscosity.

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  9. For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to

  10. A.
    x
    B.
    1/x
    C.
    x
    D.
    1/x

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  11. Velocity at a certain point in case of streamline flow is

  12. A.
    constant
    B.
    independent of time
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)

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  13. Sewage sludge is an example of the __________ fluid.

  14. A.
    Bingham plastic
    B.
    Newtonion
    C.
    pseudoplastic
    D.
    dilatent

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  15. In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.

  16. A.
    more than
    B.
    less than
    C.
    equal to
    D.
    either (a) or (b)

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  17. Multistage centrifugal pumps are generally used for

  18. A.
    high head.
    B.
    low head but high discharge.
    C.
    highly viscous liquid.
    D.
    slurries of high solid concentration.

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  19. The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is

  20. A.
    1.3
    B.
    0.766
    C.
    0.87
    D.
    none of these

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