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

Related Mcqs:

1. Low viscosity absorbent is preferred for reasons of ____________________?

   A. Rapid absorption rates and good heat transfer characteristics
   B. Improved flooding characteristics
   C. Low pressure drop on pumping
   D. All A., B. and C.

2. 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)

3. 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

4. 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

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
   Answer: Option C

6. 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.

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

   A. 1
   B. > 1
   C. < 1
   D. ≤ 1

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. According to Poiseuille’s law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)___________________?

   A. μ
   B. 1/μ
   C. √μ
   D. μ2

10. In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas solute C is soluble in both the solvents. The extraction process attains equilibrium. The equilibrium relationship between the two phases is Y* = 0.9X, where Y* is the kg of C/kg of B and X is kg of C/kg of A. Choose the correct answer?

    A. The entire amount of C is transferred to solvent B
    B. Less than 2 kg but more than 1 kg of C is transferred to solvent B
    C. Less than 1 kg of C is transferred to B
    D. No amount of C is transferred to B