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Chemical Engineering :: Fluid Mechanics

  1. Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.

  2. A.

     ∂/∂s = 0

    B.

     ∂/∂t = 0

    C.

     ∂/∂s = constant

    D.

     ∂/∂t = constant


  3. Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.

  4. A.

     ∂/∂t = 0

    B.

     ∂/∂t = constant

    C.

     ∂/∂s = 0

    D.

     ∂/∂t = constant


  5. In frictional fluid flow, the quantity, P/ρ + V²/2gc + gz/gc, is

  6. A.

     Constant along a streamline

    B.

     Not constant along a streamline

    C.

     Increased in the direction of flow

    D.

     None of these


  7. Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.

  8. A.

     1

    B.

     0.1

    C.

     0.01

    D.

     0.001


  9. Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

  10. A.

     Pipe length

    B.

     Fluid velocity in the pipe

    C.

     Time taken to close the valve

    D.

     All of the above


  11. As per Newton's law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity)

  12. A.

     1/μ

    B.

     μ

    C.

     μ²

    D.

     1/μ²


  13. Toothpaste is a

  14. A.

     Bingham plastic

    B.

     Pseudoplastic

    C.

     Newtonion liquid

    D.

     Dilatent


  15. Schedule number of a pipe, which is a measure of its wall thickness, is given by

  16. A.

     1000 P'/S

    B.

     100 P'/S

    C.

     1000 S/P'

    D.

     10000 P'/S


  17. Path followed by water jet issuing from the bottom of a water tank will be a

  18. A.

     Parabola (vertex being at the opening)

    B.

     Hyperbola

    C.

     Horizontal straight line

    D.

     Zig-zag path (which is geometrically undefined)


  19. Turbine impeller

  20. A.

     Produces only radial current

    B.

     Produces only tangential current

    C.

     Is effective over wide range of viscosities

    D.

     Does not produce tangential current