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Chemical Engineering :: Fluid Mechanics

  1. The co-efficient of drag and lift for an incompressible fluid depends on the

  2. A.

     Reynolds number

    B.

     Froude number

    C.

     Mach number

    D.

     All of the above


  3. __________ flow means the flow of incompressible fluid with no shear.

  4. A.

     Potential

    B.

     Streamline

    C.

     Creep

    D.

     Boundary layer


  5. For the same flow rate of a fluid, the pressure drop is the least for

  6. A.

     Venturimeter

    B.

     Orificemeter

    C.

     Flow-nozzle

    D.

     Δp is same for all


  7. Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the

  8. A.

     Wall roughness

    B.

     Reynolds number

    C.

     Both A and B

    D.

     Neither A nor B


  9. Propellers are

  10. A.

     Axial flow mixers

    B.

     Low speed impeller

    C.

     Used for mixingliquids of high viscosity

    D.

     Radial flow mixers


  11. Horsepower requirement for given pump capacity depends upon the

  12. A.

     Specific gravity of the liquid

    B.

     Suction lift

    C.

     Discharge head

    D.

     All of the above


  13. Working of a __________ pump characterises mixed flow.

  14. A.

     Turbine

    B.

     Piston

    C.

     Diaphragm

    D.

     None of these


  15. Which is the correct relationship for a centrifugal pump? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)

  16. A.

     D = 1840 H0.5/N

    B.

     D = 1840 N/H0.5

    C.

     H = 1840 D0.5/N

    D.

     D = 1840 H/N


  17. Purpose of air lift pump is to

  18. A.

     Compress air

    B.

     Lift compressed air

    C.

     Lift water from a well by using compressed air

    D.

     Lift air under negative pressure


  19. A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by

  20. A.

     Decreasing the size of the inlet pipe

    B.

     Increasing the size of the inlet pipe

    C.

     Lowering the pump position

    D.

     Both B and C