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Chemical Engineering :: Fluid Mechanics

  1. The fluid property which matters for fall-ing rain drops to acquire spherical shape is its

  2. A.
    pressure
    B.
    height of descend
    C.
    viscosity
    D.
    surface tension

  3. The simple pitot tube does not measure the

  4. A.
    static pressure.
    B.
    dynamic pressure.
    C.
    velocity at the stagnation point.
    D.
    all (a), (b) and (c).

  5. Boundary layer separation occurs when the

  6. A.
    pressure reaches a minimum.
    B.
    cross-section of the channel is reduced.
    C.
    valve is closed in a pipeline.
    D.
    velocity of sound is reached.

  7. The head loss in turbulent flow in a pipe varies

  8. A.
    directly as the velocity.
    B.
    inversely as the square of the velocity.
    C.
    approximately as the square of the velocity.
    D.
    inversely as the square of the diameter.

  9. For flow through an orifice from a reservoir, the actual velocity at the vena con-tracta is given by

  10. A.
    2gh
    B.
    C.V. 2gh
    C.
    Cd 2gh
    D.
    Cc 2gh

  11. The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is

  12. A.
    0.3
    B.
    0.9
    C.
    0.03
    D.
    0.66

  13. For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe , plot is

  14. A.
    1
    B.
    -1
    C.
    0.5
    D.
    -0.5

  15. A centrifugal pump loses prime after starting. The reason of this trouble may be

  16. A.
    incomplete priming.
    B.
    too high a suction lift.
    C.
    low available NPSH and air leaks in the suction pipe.
    D.
    all (a), (b), and (c).

  17. Venturimeter and orificemeter measures the __________ of the fluid.

  18. A.
    pressure
    B.
    maximum velocity
    C.
    average velocity
    D.
    point velocity

  19. Surge tanks are provided in high pressure water pipelines to

  20. A.
    store a definte quantity ofwater all the time,
    B.
    reduce the water hammer.
    C.
    facilitate easy dismantling of pipeline for cleaning and maintenance.
    D.
    none of these.