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Chemical Engineering :: Fluid Mechanics

  1. Location of vena-contracta in an orificemeter does not depend upon the

  2. A.

     Type of orifice

    B.

     Density, viscosity & compressibility of the fluid

    C.

     Ratio of pipe diameter to orifice diameter

    D.

     Pipe roughness

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  3. Mercury is an ideal barometric fluid mainly due to its

  4. A.

     High density

    B.

     Low compressibility

    C.

     Low capillary action

    D.

     Very low vapor pressure

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  5. The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is

  6. A.

     Parabolic

    B.

     Flat

    C.

     Flat near the wall and parabolic in the middle

    D.

     Parabolic near the wall and flat in the middle

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  7. A streamline is a line in flow field,

  8. A.

     That is traced by all the fluid particles passing through a given point

    B.

     Along which a fluid particle travels

    C.

     Such that at every point on it, the velocity is tangential to it

    D.

     None of these

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  9. Hot wire anemometer is used to measure the

  10. A.

     Velocity of liquids

    B.

     Temperature of liquids

    C.

     Velocity of gases

    D.

     Pressure of liquids

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  11. A pipe is defined as 'hydraulically smooth', if the friction factor

  12. A.

     Is not a function of Reynolds number

    B.

     For a given Reynolds number remains constant even on further smoothening of the pipe

    C.

     Is zero irrespective of the Reynolds number

    D.

     None of these

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  13. Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type.

  14. A.

     Axial

    B.

     Radial

    C.

     Mixed

    D.

     None of these

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  15. With increase in pump speed, its NPSH requirement

  16. A.

     Decreases

    B.

     Increases

    C.

     Remains unaltered

    D.

     Can either increase or decrease ; depends on other factors

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  17. In a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure.

  18. A.

     Rotameter

    B.

     Pitot tube

    C.

     Venturimeter

    D.

     Flow nozzle

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  19. In a stabilised soap bubble, pressure inside it compared to external pressure is

  20. A.

     More

    B.

     Less

    C.

     Same

    D.

     Unpredictable

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