Mass Transfer Multiple Choice Questions - Set 07 - ObjectiveBooks

Mass Transfer Multiple Choice Questions - Set 07

Practice Test: Question Set - 07

1. Rayleigh equation applies to __________ distillation.
    (A) Differential
    (B) Flash
    (C) Equilibrium
    (D) Molecular

2. In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as
    (A) KG = 1/KG + m/KL
    (B) 1/KG = 1/KG + m/KL
    (C) 1/KG = 1/KL + m/KG
    (D) KG = 1/KL + m/KG

3. Leaching of coarse solid lumps is also termed as
    (A) Decoction
    (B) Dissolution
    (C) Percolation
    (D) Agitation and settling

4. Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?
    (A) Dew point
    (B) Humidity ratio
    (C) Wet bulb temperature
    (D) None of these

5. Danckwerts developed the __________ theory.
    (A) Penetration
    (B) Surface renewal
    (C) Film
    (D) None of these

6. Steam distillation is used to
    (A) Reduce the number of plates
    (B) Avoid thermal decomposition of a component
    (C) Increase the efficiency of separation
    (D) Increase the total pressure of distillation

7. When an unsaturated air-water mixture is heated at constant pressure, then
    (A) The partial pressure of water vapor increases
    (B) The specific humidity decreases
    (C) The relative humidity increases
    (D) The relative humidity decreases

8. Flash distillation is
    (A) Same as differential distillation
    (B) Used for multi-component systems like crude refining
    (C) Same as simple distillation
    (D) Most useful for handling binary systems

9. Mechanism of moisture removal in case of freeze drying of food stuff is by
    (A) Evaporation
    (B) Sublimation
    (C) Dehydration
    (D) Adsorption

10. Molality is defined as the number of gm moles of solute per __________ of solvent.
    (A) Liter
    (B) gm
    (C) Kg
    (D) m3

11. When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation.
    (A) Continuous
    (B) Steam
    (C) Azeotropic
    (D) None of these

12. Alcohol is dehydrated using __________ distillation.
    (A) Extractive
    (B) Azeotropic
    (C) Steam
    (D) Molecular

13. The wet and 'dry bulb temperature for a vapor-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.
    (A) 25
    (B) > 25
    (C) < 25
    (D) - 25

14. Water entrained by circulating air in cooling towers is termed as
    (A) Drift
    (B) Blow down
    (C) Vapor load
    (D) None of these

15. Pick out the wrong statement. Raoult's law does not apply, when the
    (A) Size of component molecules are not equal
    (B) Attractive forces between like and unlike molecules in the solution are approximately equal
    (C) Component molecules are non-polar
    (D) Chemical combination or molecular association between unlike molecules takes place in the formation of solution

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