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Chemical Engineering :: Fluid Mechanics

  1. An ideal fluid is

  2. A.

     Frictionless & incompressible

    B.

     One, which obeys Newton's law of viscosity

    C.

     Highly viscous

    D.

     None of these


  3. An ideal nozzle design aims at

  4. A.

     Minimising wall friction

    B.

     Suppressing boundary layer separation

    C.

     Both A & B

    D.

     Neither A nor B


  5. Fluid resistance to shear depends upon its

  6. A.

     Rate of transfer of molecular momentum

    B.

     Cohesion

    C.

     Both A and B

    D.

     Neither A nor B


  7. Gradually varied flow in open channel is a/an __________ flow.

  8. A.

     Steady uniform

    B.

     Steady non-uniform

    C.

     Unsteady uniform

    D.

     Unsteady non-uniform


  9. The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is

  10. A.

     0.3

    B.

     0.9

    C.

     0.03

    D.

     0.66


  11. The frictional resistance in laminar flow does not depend on the

  12. A.

     Area of surface in contact

    B.

     Flow velocity

    C.

     Fluid temperature

    D.

     Pressure of flow


  13. A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to

  14. A.

     L ρv²/D

    B.

     L μ;V/D²

    C.

     D ρv²/L

    D.

     Μ V/L


  15. Most of the centrifugal pumps used in chemical plants are usually __________ driven.

  16. A.

     Steam

    B.

     Diesel engine

    C.

     Electric motor

    D.

     Gas turbine


  17. In case of coutte flow, the fluid flow is between two large flat parallel plates with

  18. A.

     Top plate moving and the bottom plate fixed

    B.

     Bottom plate moving and the top plate fixed

    C.

     Both the plates fixed

    D.

     Both the plates moving


  19. Capacity of a rotary gear pump can be varied by

  20. A.

     Changing the speed of rotation

    B.

     Bleeding air into suction

    C.

     Bypassing liquid from the suction or discharge line

    D.

     All of the above