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Chemical Engineering :: Fluid Mechanics

  1. In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as :(where, 'δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow).

  2. A.

     Re

    B.

     √Re

    C.

     1/Re

    D.

     Re-1/2


  3. Hydraulic radius is the ratio of

  4. A.

     Wetted perimeter to flow area

    B.

     Flow area to wetted perimeter

    C.

     Flow area to square of wetted perimeter

    D.

     Square root of flow area to wetted perimeter


  5. Prandtl number is a measure of the

  6. A.

     Heat conduction to viscosity of a fluid

    B.

     Cp/Cv of a fluid

    C.

     Elastic force to pressure force in the fluid flow

    D.

     Inertial force to elastic force in the fluid flow


  7. Mass velocity is independent of temperature & pressure, when the flow is

  8. A.

     Unsteady through unchanged cross-section

    B.

     Steady through changing cross-section

    C.

     Steady and the cross-section is unchanged

    D.

     Unsteady and the cross-section is changed


  9. What causes convective acceleration in fluid flow?

  10. A.

     Steep slope in flow

    B.

     Unsteady nature of flow

    C.

     Non-uniformity of flow

    D.

     Turbulence in flow


  11. Normal depth in open channel flow is the depth of flow in the channel

  12. A.

     Corresponding to uniform flow

    B.

     Measured normal to the channel bed

    C.

     Corresponding to steady flow

    D.

     None of these


  13. Which of the following is not concerned with the fluid-particle interaction?

  14. A.

     Drag co-efficient

    B.

     Froude number

    C.

     Galileo number

    D.

     Weber number


  15. Which of the following is dimensionless?

  16. A.

     Angular velocity

    B.

     Fanning friction factor

    C.

     Specific volume

    D.

     None of these


  17. The pressure co-efficient is the ratio of pressure forces to __________ forces.

  18. A.

     Viscous

    B.

     Inertial

    C.

     Gravity

    D.

     Surface tension


  19. Pressure co-efficient is the ratio of pressure forces to __________ forces.

  20. A.

     Gravity

    B.

     Inertial

    C.

     Viscous

    D.

     None of these