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Chemical Engineering :: Fluid Mechanics

  1. Potential function is applicable only for __________ flow.

  2. A.
    irrotational
    B.
    turbulent
    C.
    steady
    D.
    none of these

  3. Which of the following exemplifies a three dimensional fluid flow ?

  4. A.
    Fluid flow at the inlet to a nozzle
    B.
    Fluid flow between parallel plates
    C.
    Viscous fluid flow between converging plates
    D.
    None of these

  5. Volute of a centrifugal pump should be designed in a fashion, such that the

  6. A.
    kinetic head gets converted into static head.
    B.
    moving stream gradually reduces velocity.
    C.
    mean velocity remains constant.
    D.
    none of these.

  7. The head loss due to sudden contraction is proportional to

  8. A.
    velocity
    B.
    velocity head
    C.
    turbulence
    D.
    none of these

  9. Cavitation occurs in a centrifugal pump when the suction pressure is

  10. A.
    less than the vapour pressure of the liquid at that temperature.
    B.
    greater than the vapour pressure of the liquid at that temperature.
    C.
    equal to the vapour pressure.
    D.
    equal to the developed head.

  11. An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yield stress. Which of the following is an ideal plastic ?

  12. A.
    Sewage sludge
    B.
    Rubber latex
    C.
    Blood
    D.
    Sugar solution

  13. The capacity of a centrifugal pump Can be increased by increasing the

  14. A.
    impeller diameter or speed.
    B.
    number of pumps and joining them in series,
    C.
    number of pumps and joining them in parallel.
    D.
    all (a), (b) and (c).

  15. Which law is followed by the velocity distribution in the turbulent boundary layer?

  16. A.
    Parabolic law
    B.
    Linear law
    C.
    Logarithmic law
    D.
    None of these

  17. The losses in open channel flow generally vary as the

  18. A.
    inverse of the roughness.
    B.
    first power of the roughness.
    C.
    square of the velocity.
    D.
    inverse square of hydraulic radius.

  19. Rise of liquid in a capillary tube is due to

  20. A.
    cohesion
    B.
    adhesion
    C.
    both (a) & (b)
    D.
    neither (a) nor (b)