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Chemical Engineering :: Fluid Mechanics

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

  2. A.

     Incomplete priming

    B.

     Too high a suction lift

    C.

     Low available NPSH and air leaks in the suction pipe

    D.

     All of the above

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  3. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary

  4. A.

     Directly as square of gas density

    B.

     Directly as gas density

    C.

     Directly as square root of gas density

    D.

     Inversely as gas density

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  5. The range of a particular rotameter can be increased by

  6. A.

     Use of floats of different densities

    B.

     No means

    C.

     Increasing the diameter of the float

    D.

     Decreasing the diameter of the float

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  7. Two liquids manometer is used for measuring small pressure differences in

  8. A.

     Liquids

    B.

     Gases

    C.

     Mixture of hydrocarbons

    D.

     None of these

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  9. Pick out the wrong statement about a streamline.

  10. A.

     It is always parallel to the main direction of the fluid flow

    B.

     It is a line across which there is no flow and it is equivalent to a rigid boundary

    C.

     Streamlines intersect at isolated point of zero velocity and infintie velocity

    D.

     The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity

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  11. When larger particles e.g., grains are subjected to fluidisation, the corresponding bed produced is termed as the __________ bed.

  12. A.

     Spouted

    B.

     Sluggish

    C.

     Boiling

    D.

     Teeter

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  13. Co-efficient of velocity is __________ the coefficient of discharge.

  14. A.

     Less than

    B.

     More than

    C.

     Equal to

    D.

     Not related to

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  15. Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum

  16. A.

     Flow rate

    B.

     Mean velocity

    C.

     Both A & B

    D.

     Neither A nor B

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  17. Which of the following has the minimum compressibility?

  18. A.

     Water at room temperature

    B.

     Air at room temperature

    C.

     Oxygen at room temperature

    D.

     Nitrogen at room temperature

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  19. Cd for the orifice plate varies from

  20. A.

     0.58 to 0.8

    B.

     0.93 to 0.98

    C.

     0.2 to 0.3

    D.

     0.02 to 0.03

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