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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. Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)

    2. A.
    S2/S1
    B.
    S1/S2
    C.
    S1 - S2
    D.
    S1 x S2

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  2. Which of the following remains constant during sensible cooling process ?

    3. A.
    Specific humidity
    B.
    Partial pressure of vapour
    C.
    Both (a) and (b)
    D.
    Neither (a) nor (b)

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  3. Physical absorption is

    4. A.
    an irreversible phenomenon.
    B.
    a reversible phenomenon.
    C.
    accompanied by evolution of heat.
    D.
    both (b) and (c)

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  4. Make up water is required in a cooling tower to replace the water lost by

    5. A.
    evaporation
    B.
    drift
    C.
    blowdown and leakage
    D.
    all (a), (b) and (c)

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  5. Which of the following quantities need not be fixed before starting the design of a co-current absorber ?

    6. A.
    Heat gain or loss
    B.
    Flow rate of entering liquid
    C.
    Flow rate of gas
    D.
    None of these

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  6. Mass transfer co-efficient of liquid is

    7. A.
    affected more by temperature than that for gases.
    B.
    affected much less by temperature than that for gases.
    C.
    not affected by the temperature.
    D.
    none of these.

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  7. Absorption accompanied with chemical reaction is exemplified by the absorption of

    8. A.
    ammonia in water.
    B.
    benzol present in coke oven gas by wash oil.
    C.
    SO2 in alkaline solution.
    D.
    all (a), (b) and (c).

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  8. Which of the following unit operations makes use of Thiele-Geddes equation ?

    9. A.
    Liquid-liquid extraction
    B.
    Solid-liquid extraction
    C.
    Multicomponent absorption with chemical reaction
    D.
    Multicomponent distillation.

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  9. Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty ?

    10. A.
    Sieve plate column
    B.
    Bubble cap column
    C.
    Randomly packed column
    D.
    Wetted wall column

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  10. The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

    11. A.
    natural draft cooling tower
    B.
    induced draft cooling tower
    C.
    spray chamber
    D.
    none of these

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