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Chemical Engineering :: Fluid Mechanics

  1. If the head over the triangular notch is doubled, the discharge will increase by __________ times.

  2. A.
    2
    B.
    2.828
    C.
    5.657
    D.
    4

  3. Friction factor for a hydraulically smooth pipe at NRe = 2100 is f1. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will

  4. A.
    increase.
    B.
    decrease.
    C.
    remain unchanged.
    D.
    increase or decrease depending on the pipe material.

  5. What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air.


  6. For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to

  7. A.
    R
    B.
    R2
    C.
    R4
    D.
    R0.5

  8. Interstage coolers are provided in a multistage compressor to

  9. A.
    save power in compressing a given volume to a given pressure.
    B.
    cool the delivered air.
    C.
    achieve the exact delivery pressure.
    D.
    none of these.

  10. 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.

  11. A.
    NPSH required.
    B.
    BHP required by the pump.
    C.
    head of the liquid pumped.
    D.
    all (a), (b) and (c).

  12. Reynolds number is the ratio of

  13. A.
    viscous forces to gravity forces.
    B.
    inertial forces to viscous forces.
    C.
    viscous forces to inertial forces.
    D.
    inertial forces to gravity forces.

  14. For the manometer set up shown in the figure, the pressure difference PA - PB is given by

  15. A.
    (ρH - ρair)gH
    B.
    (ρH - ρL)gH
    C.
    (ρH - ρL) gH + (ρL - ρair) . g(L - H)
    D.
    (ρH - ρL) gL + (ρL - ρair)gH

  16. The discharge through a venturimeter depends upon

  17. A.
    pressure drop only.
    B.
    its orientation.
    C.
    co-efficient of contraction only.
    D.
    none of these.

  18. N. second/m2 is

  19. A.
    the S.I. unit of dynamic viscosity.
    B.
    the S.I. unit of kinematic viscosity.
    C.
    equivalent to one poise.
    D.
    equivalent to one stoke.