Chemical Engineering Mass Transfer Lab Viva Questions - Set 24

Practice Test: Question Set - 24

1. Penetration model (theory) for mass transfer was enunciated by
    (A) Danckwerts
    (B) Toor and Marcello
    (C) Higbie
    (D) Kissinevskii
2. Pick out the correct statement.
    (A) Bound moisture is removed during constant rate drying period
    (B) Free moisture is removed during falling rate drying period
    (C) The sum of free moisture and equilibrium moisture in a solid is called the critical moisture
    (D) The driving force for mass transfer in a wet solid is its free moisture content
3. Milk is dried usually in a __________ dryer.
    (A) Freeze
    (B) Spray
    (C) Tray
    (D) Rotary
4. Extraction of coffee from its seed is done by
    (A) Liquid-liquid extraction
    (B) Leaching
    (C) Extractive distillation
    (D) Steam distillation
5. Unit of molal diffusivity is
    (A) cm2/sec gm . mole
    (B) gm moles/cm2 . sec
    (C) gm moles/cm. sec
    (D) gm moles/cm2. sec
6. When the liquid phase and vapor phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of
    (A) Vapor pressure of component A to that of component B
    (B) Vapor pressure of component A to the total pressure
    (C) Vapor pressure of component A to the partial pressure of A
    (D) Partial pressure of component A to the total pressure
7. In case of non-ideal gases and liquids, the molal diffusivity
    (A) Varies inversely as the pressure
    (B) Varies directly as the pressure
    (C) Is independent of pressure
    (D) Is equal to the volumetric diffusivity
8. Flooding in a column results due to
    (A) High pressure drop
    (B) Low pressure drop
    (C) Low velocity of the liquid
    (D) High temperature
9. Which of the following is a suitable absorbent for removal of H2S from natural gas?
    (A) Vetrocoke solution
    (B) Monoethanolamine (MEA)
    (C) Dilute
    (D) Hot water
10. Raoult's law is applicable to the
    (A) Ideal solutions
    (B) Real solutions
    (C) Mixture of water and alcohol
    (D) Non-ideal gases
11. Humid volume is the total volume in m3 of 1 kg of
    (A) Vapor laden gas at 1 atm. and room temperature
    (B) Gas plus its accompanying vapor at 1 atm. and room temperature
    (C) Gas plus its accompanying vapor at 1 atm. and gas temperature
    (D) Vapor laden gas at 1 atm. and gas temperature
12. Calcium ammonium nitrate (a fertiliser) is dried in a __________ dryer.
    (A) Rotary
    (B) Vacuum
    (C) Tunnel
    (D) Tray
13. Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.
    (A) Molecular
    (B) Extractive
    (C) Steam
    (D) Simple
14. Pick out the system with minimum boiling azeotrope at 1 atm.
    (A) Benzene-toluene
    (B) Ethyl alcohol-water
    (C) Hydrochloric acid-water
    (D) All (a), (b) and (c)
15. Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and
    (A) Humidified with wet bulb temperature decreasing
    (B) Humidified at constant wet bulb temperature
    (C) Dehumidified
    (D) None of these
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