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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


  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


  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


  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


  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


  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


  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


  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


  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


  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