Home / Chemical Engineering / Fluid Mechanics :: Section-17

Chemical Engineering :: Fluid Mechanics

  1. The Stoke's stream function applies to the

  2. A.

     Irrotational flow only

    B.

     Ideal/non-viscous fluids only

    C.

     Cases of axial symmetry

    D.

     None of these


  3. In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)

  4. A.

     Vavg

    B.

     1.2 Vavg

    C.

     1.5 Vavg

    D.

     1.8 Vavg


  5. For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

  6. A.

     Vs/Dp²

    B.

     Vs²/Dp²

    C.

     Vs²/Dp³

    D.

     Vs/Dp³


  7. The equation given below is called the __________ .
    f-0.5 = 4.07 loge (NRe√f)-0.6

  8. A.

     Colebrook formula

    B.

     Von-Karman equation

    C.

     Fanning equation

    D.

     None of these


  9. The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop fo __________ fluid.

  10. A.

     Dilatant

    B.

     Pseudoplastic

    C.

     Bingham plastic

    D.

     Newtonion


  11. Permanent loss in a venturimeter is about __________ percent of the pressure drop in theupstream cone.

  12. A.

     1

    B.

     10

    C.

     40

    D.

     70


  13. The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be

  14. A.

     Δp

    B.

     2Δp

    C.

     Δp²

    D.

     Δp/2


  15. The simple pitot tube measures the __________ pressure.

  16. A.

     Static

    B.

     Dynamic

    C.

     Total

    D.

     None of these


  17. The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec.

  18. A.

     1.8

    B.

     12.4

    C.

     186.2

    D.

     736.4


  19. Which of the following is not a dimension-less parameter?

  20. A.

     Euler number

    B.

     Specific gravity

    C.

     Fanning friction factor

    D.

     None of these