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Chemical Engineering :: Fluid Mechanics

  1. Velocity of liquid hydrocarbon fuels in a pipeline can not be measured by magnetic flowmeters, because their __________ is very low/small.

  2. A.

     Thermal conductivity

    B.

     Electrical conductivity

    C.

     Specific gravity

    D.

     Electrical resistivity

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  3. For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

  4. A.

     V/Vmax = (x/r)1/7

    B.

     V/Vmax = (r/x)1/7

    C.

     V/Vmax = (x.r)1/7

    D.

     None of these

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  5. Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

  6. A.

     D

    B.

     1/d

    C.

     Σ

    D.

     L/σ

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  7. What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air.

  8. A.

     4πg/3

    B.

     0.01πgH/4

    C.

     0.01πgH/8

    D.

     0.04πgH/3

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  9. With increase in molecular weight of the gas, the head developed by a centrifugal compressor will

  10. A.

     Decrease

    B.

     Increase

    C.

     Remain same

    D.

     Unpredictable

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  11. Priming of a centrifugal pump is done to

  12. A.

     Increase the mass flow rate of fluid

    B.

     Develop effective pressure rise by the pump

    C.

     Avoid chances of separation inside the impeller

    D.

     None of these

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  13. Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as

  14. A.

     V1.8

    B.

     V-0.2

    C.

     V2.7

    D.

     V2

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  15. __________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm².

  16. A.

     Centrifugal

    B.

     Piston

    C.

     Plunger

    D.

     Vane

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  17. Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor.

  18. A.

     Less than

    B.

     More than

    C.

     Same as

    D.

     None of these

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  19. The terminal velocity of a small sphere settling in a viscous fluid varies as the

  20. A.

     First power of its dimeter

    B.

     Inverse of the fluid viscosity

    C.

     Inverse square of the diameter

    D.

     Square of the difference in specific weights of solid & fluid

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