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Chemical Engineering :: Fluid Mechanics

  1. The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids

  2. A.
    having high viscosities.
    B.
    moving at low velocities.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

  3. The excess of the sum of pressure & velocity heads over the vapor pressure of the liquid at the suction is called the

  4. A.
    static submergence.
    B.
    net positive suction head (NPSH).
    C.
    cavitation sensitivity.
    D.
    priming.

  5. Piezometric head is the sum of the __________ heads.

  6. A.
    elevation & kinetic energy
    B.
    elevation & pressure
    C.
    kinetic energy & pressure
    D.
    none of these

  7. Propellers are

  8. A.
    axial flow mixers.
    B.
    low speed impeller.
    C.
    used for mixingliquids of high viscosity.
    D.
    radial flow mixers.

  9. Which of the following is not an advantage of fluidisation from transfer operation point of view?

  10. A.
    Intimate contact of the fluid with all parts of the solid particles.
    B.
    Lower fluid pumping power requirement.
    C.
    Minimisation of temperature variation.
    D.
    Prevention of particle seggregation.

  11. Upto what value of 'Mach number', a fluid may be considered as incompressible ?

  12. A.
    0.03
    B.
    0.3
    C.
    3
    D.
    10

  13. The head developed by a centrifugal pump is largely determined by the

  14. A.
    power of the pump.
    B.
    nature of the liquid being pumped.
    C.
    angle of the vanes and the speed of the tip of the impeller.
    D.
    vapour pressure of the liquid.

  15. Pick out the wrong statement:

  16. A.
    Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer.
    B.
    Blowers develop a maximum pressure of 2 atmospheres.
    C.
    Friction losses in pipe fittings are generally expressed in terms of velocity heads.
    D.
    Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number.

  17. Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a

  18. A.
    pitot tube
    B.
    manometer
    C.
    rotameter
    D.
    none of these

  19. Potential flow is the flow of

  20. A.
    compressible fluids with shear.
    B.
    compressible fluids with no shear.
    C.
    incompressible fluids with shear.
    D.
    incompressible fluids with no shear.