Mass Transfer Chemical Engineering Notes MCQ - Set 03 - ObjectiveBooks

Mass Transfer Chemical Engineering Notes MCQ - Set 03

Practice Test: Question Set - 03

1. In steam distillation, the
    (A) Temperature is 100°C
    (B) Temperature is more than 100° C
    (C) Product must be immiscible with water
    (D) Temperature is higher than the boiling point of either component

2. The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 - PA2) is for
    (A) Fick's second law of diffusion
    (B) Steady state diffusion for stagnant case
    (C) Liquid M.T.C. by Higbie penetration theory
    (D) None of these

3. A slurry is to be dried to produce flaky solid. Which dryer would you recommend?
    (A) Spray dryer
    (B) Drum dryer
    (C) Rotary dryer
    (D) Dielectric dryer

4. Perforated plate towers are unique for solvent extraction because, they provide
    (A) Higher contact area
    (B) Better contact of the phase
    (C) Repeated coalescence & redispersion of the drop phase
    (D) None of these

5. Which of the following parameters remains constant during chemical dehumidification?
    (A) Dry bulb temperature
    (B) Partial pressure of vapor
    (C) Wet bulb temperature
    (D) None of these

6. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2a: interfacial area per unit volume of tower)
    (A) G/(FG . a)
    (B) FG/(G . a)
    (C) (G . a)/FG
    (D) L/(FG . G)

7. Coffee is prepared from coffee beans by leaching with
    (A) Cold water
    (B) Hot water
    (C) Dilute hot caustic solution
    (D) Naphtha

8. Pore size of the molecular sieve 5A is __________ mm.
    (A) 5
    (B) 0.5
    (C) 0.05
    (D) 50

9. The equation, NA = (DAB . Pt /RTZ) (y1 - y2) is for
    (A) Steady state equimolar counter diffusion
    (B) Fick's first law of diffusion
    (C) Steady state diffusion for stagnant case
    (D) Liquid M.T.C. by penetration theory

10. To remove all the moisture from a wet solid it requires exposure to __________ air.
    (A) Perfectly dry
    (B) Highly humid
    (C) High temperature
    (D) None of these

11. Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)
    (A) (De.t)1/2
    (B) (De/t)1/2
    (C) (4Det)1/2
    (D) (4De/t)

12. The cooling effect in a cooling tower can be speeded up by
    (A) Increasing the air velocity and area of exposed wet surface
    (B) Reducing the barometric pressure
    (C) Reducing the humidity of the air
    (D) All (a), (b) and (c)

13. The relative volatility of a binary mixture at the Azeotropic composition is
    (A) 1
    (B) > 1
    (C) 0

14. Which of the following processes is not an example of adsorption applied to gaseous separations?
    (A) Recovery of valuable solvent vapors from dilute mixture with air and other gases
    (B) Dehumidification of air and gas
    (C) Removal of objectionable odour and impurities from industrial gases
    (D) Decolouration of yellow glycerine

15. For absorbing a sparingly soluble gas in a liquid, the
    (A) Gas side co-efficient should be increased
    (B) Liquid side coefficient should be increased
    (C) Gas side co-efficient should be decreased
    (D) Liquid side co-efficient should be decreased

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