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Chemical Engineering :: Fluid Mechanics

  1. Boundary layer exists in flow

  2. A.

     Of real fluids

    B.

     Over flat surfaces only

    C.

     In pipes only

    D.

     Of ideal fluids only

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  3. Buoyant force

  4. A.

     For non-symmetrical bodies is not vertical

    B.

     Depends on the depth of the submergence of the floating body

    C.

     Depends on the weight of the floating body

    D.

     None of these

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  5. The line of action of the buoyant force acts through the

  6. A.

     Centroid of the displaced volume of fluid

    B.

     Centre of gravity of a submerged body

    C.

     Centroid of the volume of any floating body

    D.

     None of these

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  7. In a dry packed bed, the pressure drop will be changed by increasing the flow rate as

  8. A.

     V1.8

    B.

     V-0.8

    C.

     V

    D.

     V-1

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  9. Identification of pipelines carrying different liquids and gases is done by the __________ of the pipe.

  10. A.

     Diameter

    B.

     Colour

    C.

     Altitude

    D.

     None of these

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  11. An isentropic process is the one, in which

  12. A.

     pv = constant

    B.

     pvr = constant

    C.

     pvr = constant, and process is reversible

    D.

     None of these

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  13. Actual lift of a pump is always less than the theoretical lift and is limited by the

  14. A.

     Specific gravity & temperature of the liquid

    B.

     Leakage & pressure decreasing at higher elevations

    C.

     Frictional resistance through pipes, fittings & passages

    D.

     All of the above

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  15. Which of the following can be used to create a flow of gas, where no significant compression is required?

  16. A.

     Reciprocating compressor

    B.

     Blower

    C.

     Axial flow compressor

    D.

     Centrifugal compressor

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  17. Choking in case of pipe flow means that a

  18. A.

     Specified mass flow rate can not be achieved

    B.

     Valve is closed in the line

    C.

     Restriction in flow cross-section area occurs

    D.

     None of these

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  19. Cavitation can be prevented by

  20. 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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