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Chemical Engineering :: Fluid Mechanics

  1. Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?

  2. A.
    Increasing the impeller speed and the volute area.
    B.
    Increasing the number of vanes in the impeller.
    C.
    Mounting of two or more impellers in series on a single shaft.
    D.
    Either of (a), (b) or (c).

  3. An equipotential line is __________ to the velocity vector at every point.

  4. A.
    normal
    B.
    normal
    C.
    tangential
    D.
    none of these

  5. Specific speed for a centrifugal pump is


  6. Path followed by water jet issuing from the bottom of a water tank will be a

  7. A.
    parabola (vertex being at the opening).
    B.
    hyperbola.
    C.
    horizontal straight line.
    D.
    zig-zag path (which is geometrically undefined).

  8. Which of the following produces maximum pressure difference for transportation of gases ?

  9. A.
    Vaccum pumps
    B.
    Blowers
    C.
    Fans
    D.
    Compressors

  10. For flow through a venturi at a particular discharge, the correct relationships among velocities at point X, Y and Z would be

  11. A.
    V1 < V2 < V3
    B.
    V2 > V1 and V2 > V3
    C.
    V1 > V2 > V3
    D.
    none of these.

  12. Drag co-efficient in hindered settling is __________ that in free settling.

  13. A.
    less than
    B.
    equal to
    C.
    not necessarily greater than
    D.
    always greater than

  14. Efficiency of power transmission (η) through a circular pipe is given by (ht - hf)/ht, which has a maximum value of __________ percent.

  15. A.
    33:3
    B.
    50
    C.
    66.6
    D.
    88.8

  16. One dimensional fluid flow implies the

  17. A.
    flow in straight lines only.
    B.
    uniform flow.
    C.
    steady uniform flow.
    D.
    flow in which transverse components are zero.

  18. __________ forces act on a particle moving through a stationary fluid.

  19. A.
    Gravity
    B.
    Drag
    C.
    Buoyant
    D.
    all (a), (b), & (c)