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Chemical Engineering :: Fluid Mechanics

  1. Which of the following quantities are computed by using the hydraulic radius for non-circular ducts?

  2. A.

     Velocity and relative roughness

    B.

     Head loss and velocity

    C.

     Reynold number, relative roughness and head loss

    D.

     Reynolds number and friction factor


  3. The ratio of wall drag to total drag in the Stoke's law range is

  4. A.

     0.5

    B.

     1

    C.

     1/3

    D.

     2/3


  5. The most serious disadvantage of an orificemeter is that

  6. A.

     It is not very accurate

    B.

     It is very costly

    C.

     Most of the pressure drop is not recoverable

    D.

     It is not suitable for measuring gas flow


  7. For a reciprocating pump, the indicator diagram is the graph between the

  8. A.

     Discharge and overall efficiency

    B.

     Volume swept by piston for one complete revolution and the pressure in the cylinder

    C.

     Angle swept by the crank pin at any instant and the discharge

    D.

     None of these


  9. Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have

  10. A.

     Very low speeds

    B.

     Smaller discharge

    C.

     Higher capital &maintenance cost

    D.

     High vibrations


  11. Propeller type centrifugal pumps are most suitable for

  12. A.

     High capacity at high heads

    B.

     High capacity at low heads

    C.

     Low capacity at high heads

    D.

     Low capacity at low heads


  13. The pipe wall thickness is minimum for a pipe of given nominal size having schedule number

  14. A.

     160

    B.

     120

    C.

     80

    D.

     40


  15. The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by

  16. A.

     4x

    B.

     2x

    C.

     x

    D.

     √x


  17. Which of the following two quantities when same, makes one pipe system equivalent to another pipe system?

  18. A.

     Head & discharge

    B.

     Length & discharge

    C.

     Length & diameter

    D.

     Friction factor & diameter


  19. The component of acceleration resulting due to unsteady nature of flow is called __________ acceleration.

  20. A.

     Normal

    B.

     Local

    C.

     Convective

    D.

     Tangential