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Chemical Engineering :: Fluid Mechanics

  1. The bulk modulus of elasticity of a liquid

  2. A.

     Is zero for incompressible liquid

    B.

     Decreases with pressure

    C.

     Is independent of temperature & pressure

    D.

     Increases with pressure

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  3. For the transfer of solution of thick slurry, the pump used is a __________ pump.

  4. A.

     Reciprocating

    B.

     Gear

    C.

     Diaphragm

    D.

     Centrifugal

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  5. Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.

  6. A.

     NPSH required

    B.

     BHP required by the pump

    C.

     Head of the liquid pumped

    D.

     All of the above

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  7. In laminar flow through a round tube, the discharge varies

  8. A.

     Linearly as the viscosity

    B.

     Inversely as the pressure drop

    C.

     Inversely as the viscosity

    D.

     As the square of the radius

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  9. What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate?

  10. A.

     0.5

    B.

     1

    C.

     1.5

    D.

     2

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  11. The hydrodynamic and thermal boundary layers will merge, when

  12. A.

     Prandtl number is one

    B.

     Schmidt number tends to infinity

    C.

     Nusselt number tends to infinity

    D.

     Archimedes number is greater than 10000

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  13. Unit of mass velocity is

  14. A.

     Kg/hr

    B.

     Kg/m². hr

    C.

     Kg/m²

    D.

     Kg/m³. hr

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  15. Scale up of agitator design requires

  16. A.

     Geometrical similarity only

    B.

     Dynamic similarity only

    C.

     Both geometrical and dynamic similarity

    D.

     All of the above

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  17. A centrifugal pump is called a turbine pump, if it is having a

  18. A.

     Turbine type impeller

    B.

     Vaned diffusion casing

    C.

     Rotating vaned volute

    D.

     None of these

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  19. The head loss in turbulent flow in a pipe varies

  20. A.

     As velocity

    B.

     As (velocity)²

    C.

     Inversely as the square of diameter

    D.

     Inversely as the velocity

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