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Chemical Engineering :: Fluid Mechanics

  1. At high Reynolds number

  2. A.
    inertial forces control and viscous forces are unimportant.
    B.
    viscous forces predominate.
    C.
    inertial forces are unimportant and viscous forces control.
    D.
    none of these.

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  3. Power loss in an orificemeter is __________ that in a venturimeter.

  4. A.
    less than
    B.
    same as
    C.
    more than
    D.
    data insufficient, cannot be predicted

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  5. The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime ?

  6. A.
    0.5
    B.
    1
    C.
    1.5
    D.
    3

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  7. What is the normal range of exit cone angle of a venturimeter ?

  8. A.
    2 to 5
    B.
    7 to 15
    C.
    15 to 25
    D.
    >25

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  9. The dimension of dynamic viscosity is

  10. A.
    ML-1T-1
    B.
    L2T-1
    C.
    LT-2
    D.
    ML-1T-2

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  11. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity

  12. A.
    same as that of A.
    B.
    one fourth as that of A.
    C.
    twice as that of A.
    D.
    four times as that of A.

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  13. The pitot static tube does not measure the __________ pressure.

  14. A.
    static
    B.
    total
    C.
    difference in static & dynamic
    D.
    all (a), (b) and (c)

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  15. The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.

  16. A.
    Bingham
    B.
    Newtonion
    C.
    perfect
    D.
    none of these

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  17. In fluid flow, cavitation is caused, if the

  18. A.
    fluid velocity decreases to zero.
    B.
    total energy decreases.
    C.
    both (a) and (b).
    D.
    flow pressure approaches its vapor pressure at the prevailing temperature.

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  19. The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

  20. A.
    0.5
    B.
    1
    C.
    1.5
    D.
    2

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