MCQ Computer Test Chemical Engineering Mass Transfer - Set 13 - ObjectiveBooks

MCQ Computer Test Chemical Engineering Mass Transfer - Set 13

Practice Test: Question Set - 13

1. The operating cost of a distillation column at minimum reflux ratio is
    (A) Minimum
    (B) Maximum
    (C) Infinite
    (D) Zero

2. For a single component absorber, the operating line is straight only when plotted in term of __________ units.
    (A) Partial pressure
    (B) Mole ratio
    (C) Mole fraction
    (D) None of these

3. The cooling effect in a cooling tower cannot be increased by
    (A) Increasing the air velocity over the wet surfaces
    (B) Reducing the humidity of entering air
    (C) Lowering the barometric pressure
    (D) None of these

4. Separation of __________ employs gaseous diffusion process.
    (A) N2 and O2 from air
    (B) Isotopes of uranium
    (C) Isotopes of helium
    (D) SO2 and air

5. Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.
    (A) Plate
    (B) Baffle
    (C) Packed
    (D) None of these

6. Leaching rate is independent of the
    (A) Agitation
    (B) Temperature
    (C) Particle size
    (D) None of these

7. With increase in temperature, the rate of leaching increases, because the
    (A) Diffusivity of solute increases
    (B) Viscosity of solvent decreases
    (C) Thermal conductivity of solute increases
    (D) None of these

8. Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.
    (A) Less than
    (B) More than
    (C) Equal to
    (D) Either (a) or (b); depends on the solid

9. The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is
    (A) 2
    (B) 0.5
    (C) 50
    (D) 150

10. Which of the following is not a batch drier?
    (A) Truck drier
    (B) Agitated pan drier
    (C) Fluidized bed drier
    (D) Vacuum shelf drier

11. Acetic acid will be most economically separated from a dilute solution of acetic acid in water by
    (A) Solvent extraction
    (B) Continuous distillation
    (C) Evaporation
    (D) Absorption

12. The main reason for dividing a tall packed tower into series of small towers is to
    (A) Minimize the overall pressure drop
    (B) Avoid flooding
    (C) Reduce liquid hold up
    (D) Avoid channelling

13. The most efficient cooling tower out of the following is
    (A) Induced draft
    (B) Forced draft
    (C) Natural draft
    (D) Atmospheric

14. Molecular distillation is
    (A) High temperature distillation
    (B) For heat-sensitive materials
    (C) Very low pressure distillation
    (D) Both (b) and (c)

15. The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is
    (A) 1
    (C) 0.5
    (D) 2

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