581. Which of the following equipments is not used in liquid-liquid extraction?
Pachuka tank
Agitated vessels
Centrifugal extractors
Packed towers
✅ The correct answer is option A.
Mass Transfer MCQs
582. Co-current absorbers are usually used when the gas to be dissolved in the liquid is
Sparingly soluble
Highly soluble
A pure substance
A mixture
✅ The correct answer is option C.
583. Dew point of a gas-vapour mixture
Increases with temperature rise
Decreases with temperature rise
Decreases with decrease in pressure
Increases with increase in pressure
✅ The correct answer is option C.
584. Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ coloumn.
Spray
Packed
Bubble cap plate
Wetted wall
✅ The correct answer is option D.
585. 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.
The entire amount of C is transferred to solvent B
Less than 2 kg but more than 1 kg of C is transferred to solvent B
Less than 1 kg of C is transferred to B
No amount of C is tranferred to B
✅ The correct answer is option A.
586. The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is
2
0.5
50
150
✅ The correct answer is option A.
587. Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
High evaporation losses of water
High pressure drop of the gas
Difficulty in its fabrication
None of these
✅ The correct answer is option B.
588. Experimental determination of __________ is done by wetted wall column method.
Diffusion co-efficient
Mass transfer co-efficient
NTU
None of these
✅ The correct answer is option B.
589. The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are
Parallel
Straight
Both parallel and straight
Neither parallel nor straight
✅ The correct answer is option C.
590. When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used.
Mixture of two gases
Pure gas
Ideal gas
Sparingly soluble gas
✅ The correct answer is option B.