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Chemical Engineering :: Fluid Mechanics

  1. A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is

  2. A.
    25.61 kPa
    B.
    11.77 kPa
    C.
    14.86 kPa
    D.
    21.13 kPa

  3. Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?

  4. A.
    Decrease in effect
    B.
    Increase in thrust
    C.
    Develops noise
    D.
    Develops high pressure

  5. For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary

  6. A.
    directly as square of gas density.
    B.
    directly as gas density.
    C.
    directly as square root of gas density.
    D.
    inversely as gas density.

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

  8. A.
    Hagen-Poiseulle's equation
    B.
    Stoke's law
    C.
    Navier-stokes equation
    D.
    none of these

  9. It is possible to integrate an automatic flow controller to a

  10. A.
    flow nozzle
    B.
    venturimeter
    C.
    rotameter
    D.
    none of these

  11. For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is

  12. A.
    more
    B.
    less
    C.
    equal
    D.
    independent of porosity

  13. For a reciprocating pump, the indicator diagram is the graph between the

  14. A.
    discharge and overall efficiency.
    B.
    volume swept by piston for one complete revolution and the pressure in the cylinder.
    C.
    angle swept by the crank pin at any instant and the discharge.
    D.
    none of these.

  15. The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the

  16. A.
    barometric pressure
    B.
    speed of the impeller
    C.
    diameter of the impeller
    D.
    both (b) and (c)

  17. High specific speed of a pump implies that, it is a/an __________ pump.

  18. A.
    centrifugal
    B.
    mixed flow
    C.
    axial flow
    D.
    none of these

  19. A gas (density = 1.5 kg/m3 , viscosity = 2x 10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be

  20. A.
    8400 Pa/m
    B.
    12600 Pa/m
    C.
    18900 Pa/m
    D.
    16800 Pa/m