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

Related Mcqs:

1. With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas________________?

   A. Increases
   B. Decreases
   C. Decreases linearly
   D. Remain unaffected

2. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?

   A. Decreases
   B. Remains unchanged
   C. Increases
   D. Decreases exponentially

3. 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.

4. 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/m2, a: interfacial area per unit volume of tower) ?

   A. G/(FG . a)
   B. FG/(G . a)
   C. (G . a)/FG
   D. L/(FG . G)

5. 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

6. 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

7. 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.

8. To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate) ____________________?

   A. Increase both ‘G’ and ‘S’
   B. Decrease both ‘G’ and ‘S’
   C. Increase ‘S’ and decrease ‘G’
   D. Increase ‘G’ and decrease ‘S’

9. The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line) ?

   A. L/mG
   B. G/mL
   C. mL/G
   D. LG/m

10. 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.