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Chemical Engineering :: Fluid Mechanics

  1. Permanent loss in a venturimeter is about __________ percent of the pressure drop in theupstream cone.

  2. A.
    1
    B.
    10 .
    C.
    40
    D.
    70

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  3. Volume of liquid displaced by a floating body is equivalent to its

  4. A.
    own weight
    B.
    submerged weight
    C.
    own volume
    D.
    submerged volume

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  5. The __________ is measured by a piezometric opening.

  6. A.
    dynamic pressure
    B.
    static pressure
    C.
    total pressure
    D.
    point velocity

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  7. What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir ?

  8. A.
    Penstock
    B.
    Siphon
    C.
    Tunnel
    D.
    Pressure pipeline

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  9. Steady uniform flow is represented by flow through a/an

  10. A.
    long pipe at constant rate.
    B.
    long pipe at decreasing rate.
    C.
    expanding tube at constant rate.
    D.
    none of these.

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  11. Pick out the correct statement pertaining to the flow through a converging-diverging tube.

  12. A.
    The value of Mach number is always unity at the throat.
    B.
    No shock wave develops in the tube when the Mach number at exit is greater than unity.
    C.
    Throughout the converging portion of the tube, the density increases in the downstream direction.
    D.
    none of these.

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  13. Cavitation can be prevented by

  14. A.
    suitably designing the pump.
    B.
    maintaining the suction head sufficiently greater than the vapour pressure.
    C.
    maintaining suction head = developed head.
    D.
    maintaining suction head lower than the vapour pressure.

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  15. Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will

  16. A.
    increase
    B.
    decrease
    C.
    remain same
    D.
    be quadrupled

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  17. Steady flow occurs, when the

  18. A.
    conditions change steadily with time.
    B.
    conditions are the same at the adjacent points at any instant.
    C.
    conditions do not change with time at any point.
    D.
    rate of the velocity change is constant.

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  19. With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost

  20. A.
    increases
    B.
    decreases
    C.
    remains unchanged
    D.
    increases exponentially

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