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Chemical Engineering :: Fluid Mechanics

  1. __________ is an example of axial flow impeller.

  2. A.
    Paddle
    B.
    Turbine
    C.
    Propeller
    D.
    all (a), (b) and(c)

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  3. Froude number is not a factor

  4. A.
    for Reynolds number greater than 300.
    B.
    when there is no vortex formation.
    C.
    for unbaffled tank.
    D.
    none of these.

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  5. If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).

  6. A.
    Q = Q1 + Q2 + Q3
    B.
    V1 = V2 = V3
    C.
    Q1 = Q2 = Q3
    D.
    f = f1 + f2 + f3

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  7. Horsepower requirement for given pump capacity depends upon the

  8. A.
    specific gravity of the liquid
    B.
    suction lift
    C.
    discharge head
    D.
    all (a), (b) and (c)

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  9. Bernoulli's equation accounts for the

  10. A.
    various momentums
    B.
    various masses
    C.
    different forms of mechanical energy
    D.
    none of these

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  11. __________ pumps are a group of vacuum pumps.

  12. A.
    Hyter
    B.
    Sump
    C.
    Mono
    D.
    Submerged

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  13. Plunger pumps are used for

  14. A.
    higher pressure
    B.
    slurries
    C.
    viscous mass
    D.
    none of these

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  15. What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ?

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

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  17. In turbulent flow, the

  18. A.
    fluid particles move in an orderly manner.
    B.
    momentum transfer is on molecular scale only.
    C.
    shear stress is caused more effectively by cohesion than momentum transfer.
    D.
    shear stresses are generally larger than in a similar laminar flow.

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  19. Momentum correction factor used in fluid flow problems accounts for the

  20. A.
    change in direction of flow.
    B.
    change in total energy.
    C.
    change in pressure.
    D.
    non uniform direction of velocities at inlet & outlet sections.

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