Physical absorption is__________________?

Related Mcqs:

1. In a gas-liquid absorption column, for obtaining the maximum absorption efficiency___________________?

   A. Liquid stream should be distributed uniformly
   B. Gas stream should be distributed uniformly
   C. Both gas as well as liquid streams should be distributed uniformly
   D. By passing should be completely avoided

2. In a gas-liquid absorption column, for obtaining the maximum absorption efficiency____________________?

   A. Liquid stream should be distributed uniformly
   B. Gas stream should be distributed uniformly
   C. Both gas as well as liquid streams should be distributed uniformly
   D. By passing should be completely avoided
   Answer: Option C

3. Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in_________________?

   A. Decreased solute solubility
   B. Large minimum liquid to gas (L/G) ratio
   C. Large number of trays
   D. All A., B. and C.

4. Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be_________________?

   A. 1
   B. > 1
   C. < 1
   D. ≤ 1

5. Absorption accompanied with chemical reaction is exemplified by the absorption of___________________?

   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.

6. In the absorption of ammonia in water, the main resistance to absorption is by the _________________ phase?

   A. Liquid
   B. Gas
   C. Both A. & B.
   D. Neither A. nor B.

7. In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG ______________ the absorption factor?

   A. Increases with increase in
   B. Is one at unity value of
   C. Both A. and B.
   D. Neither A. nor B.

8. In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is__________________?

   A. Equal to the heat of formation of surface compound
   B. Equal to the heat of wetting
   C. Zero
   D. Called integral heat of adsorption

9. For gas absorption, low viscosity solvents are preferred, because of their ____________________?

   A. Better flow characteristics
   B. Low pumping pressure drop
   C. Rapid absorption rates
   D. All A., B. and C.

10. The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

    A. Liquid side
    B. Gas side
    C. Interfacial
    D. Both liquid and gas side