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Chemical Engineering :: Fluid Mechanics

  1. Transition from laminar flow to turbulent flow is aided by the

  2. A.

     Surface roughness and curvature (i.e.sharp corners)

    B.

     Vibration

    C.

     Pressure gradient and the compressibility of the flowing medium

    D.

     All of the above


  3. Capillary tube method of viscosity measurement is based on the

  4. A.

     Hagen-Poiseulle's equation

    B.

     Stoke's law

    C.

     Navier-stokes equation

    D.

     None of these


  5. In power law, ζ = A (du/dy)² + B , then the fluid is

  6. A.

     Newtonian

    B.

     Dilatant

    C.

     Thixotropic

    D.

     Rheopectic


  7. In deriving Bernoulli's equation, fluid is assumed to be

  8. A.

     Incompressible, frictionless, steady, along a streamline

    B.

     Uniform, steady, incompressible, along a streamline

    C.

     Steady, density being pressure dependent, frictionless

    D.

     None of these


  9. Cp/Cv is termed as

  10. A.

     Adiabatic constant

    B.

     Mach number

    C.

     Weber number

    D.

     Prandtl number


  11. The equivalent diameter for flow through a rectangular duct of width B and height H is

  12. A.

     HB/2(H + B)

    B.

     HB/(H + B)

    C.

     2HB/(H + B)

    D.

     4HB/(H + B)


  13. As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1

  14. A.

     Increases linearly with V

    B.

     Decreases linearly with V

    C.

     Decreases as V²

    D.

     None of these


  15. Delivery of insufficient quantity of liquid by a pump may be caused by

  16. A.

     Air leak in the inlet

    B.

     Low rpm

    C.

     Too high a lift

    D.

     All of the above


  17. Design of the casing of centrifugal pump should be such as to minimise the

  18. A.

     Back flow through impeller

    B.

     Loss of kinetic head

    C.

     Loss of static head

    D.

     None of these


  19. A lubricant 100 times more viscous than water would have a viscosity (in Pa.s)

  20. A.

     0.01

    B.

     0.1

    C.

     1

    D.

     10