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Chemical Engineering :: Fluid Mechanics

  1. The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the

  2. A.
    inverse of fluid viscosity.
    B.
    square of particle size.
    C.
    difference in the densities of the particle & fluid.
    D.
    all (a), (b) and (c).

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  3. Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined)?

  4. A.
    ε = ε0 + α.t
    B.
    ε = ε0 + α.t2
    C.
    ε = ε0 + α.t3
    D.
    ε = ε0 + α.t4

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  5. Nominal size of a pipe is an indication of its __________ diameter.

  6. A.
    inner
    B.
    outer
    C.
    approximate
    D.
    none of these

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  7. Fluidised beds are formed, when the

  8. A.
    fluid friction is zero
    B.
    gravity force is less than the fluid friction.
    C.
    pressure forces equal gravity forces.
    D.
    sum of the fluid friction and pressure forces is equal and opposite to gravity forces.

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  9. A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp.

  10. A.
    1
    B.
    10/55
    C.
    5.5
    D.
    1/55

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  11. Pick out the wrong statement:

  12. A.
    The vacuum pressure is always the negative gauge pressure.
    B.
    The pressure of the liquid measured by a piezometer tube is the gauge pressure.
    C.
    Manometric liquid should have high surface tension.
    D.
    The point at which the resultant pressure on an immersed surface acts, is known as the centre of gravity.

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  13. Medium viscosity lubricating oil can be most ideally pumped by a __________ pump.

  14. A.
    vane
    B.
    piston
    C.
    centrifugal
    D.
    plunger

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  15. In a fully turbulent flow (Re > 105) in a pipe of diameter 'd', for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is

  16. A.
    d
    B.
    d2
    C.
    d2.5
    D.
    d4

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  17. Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump.

  18. A.
    reciprocating
    B.
    plunger
    C.
    electromagnetic
    D.
    gear

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  19. Small pressure differences in liquids is measured using a/an

  20. A.
    U-tube manometer.
    B.
    inclined tube manometer.
    C.
    pitot tube.
    D.
    none of these.

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