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Chemical Engineering :: Mass Transfer

Mass Transfer - Section 1
Mass Transfer - Section 2
Mass Transfer - Section 3
Mass Transfer - Section 4
Mass Transfer - Section 5
Mass Transfer - Section 6
Mass Transfer - Section 7
Mass Transfer - Section 8
Mass Transfer - Section 9
Mass Transfer - Section 10
Mass Transfer - Section 11
Mass Transfer - Section 12
Mass Transfer - Section 13
Mass Transfer - Section 14

  1. Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

    2. A.
    only vapor phase follows Raoult's law.
    B.
    only liquid phase obeys Dalton's law.
    C.
    liquid phase obeys Dalton's law and vapor phase obeys Raoult's law.
    D.
    Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law.

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  2. Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.

    3. A.
    less than
    B.
    more than
    C.
    equal to
    D.
    either (o) or (b); depends on the solid

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  3. Lewis number (Le) is

    4. A.
    Sc x Pr
    B.
    Pr x St
    C.
    Sh x Pr
    D.
    St x Sh

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  4. Which of the following is not a continuous leaching equipment ?

    5. A.
    Pachuka tank
    B.
    Kennedy extractor
    C.
    Bollman extractor
    D.
    Hydrocyclones

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  5. __________ extractor is used for the concentration of radioactive nuclear waste.

    6. A.
    Pulsed column
    B.
    Seive plate
    C.
    Mixer-settler
    D.
    Ballman

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  6. Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.

    7. A.
    free
    B.
    unbound
    C.
    equilibrium
    D.
    bound

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  7. All moisture in a non-hygroscopic material is the __________ moisture.

    8. A.
    free
    B.
    equilibrium
    C.
    unbound
    D.
    bound

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  8. Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

    9. A.
    (1 + Ro) = Ro/Ri
    B.
    (1 - Ro) = Ro/Ri
    C.
    (1 + Ri) = Ro/Ri
    D.
    (1 - Ri) = Ro/Ri

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  9. Separation of __________ employs gaseous diffusion process.

    10. A.
    N2 and O2 from air
    B.
    isotopes of uranium
    C.
    isotopes of helium
    D.
    SO2 and air

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  10. For water-ethanol system, the minimum reflux ratio

    11. A.
    is computed from the slope of the upper operating line that is tangent to the equilibrium curve.
    B.
    is computed from the intercept of the operating line.
    C.
    cannot be computed.
    D.
    is the optimum reflux ratio.

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