This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Equipment for Solvent Extraction(b)”.
1. Which is the simple and the oldest technique for solvent extraction?
a) Spray column
b) Packed column
c) Plate column
d) Decanter
View Answer
Explanation: Spray column is the simplest and oldest technique for solvent extraction.
2. Why are spray columns rarely used?
a) High cost
b) High efficiency
c) More size of equipment required
d) Due to axial dispersion
View Answer
Explanation: Axial dispersion is so serious that with an increase in diameter-length ratio the continuous phase completely disperses.
3. How does packing the column help?
a) Lessens the mass transfer
b) Increases the mass transfer by not breaking the large drops
c) Decreases the interfacial area
d) Increases the mass transfer by breaking the large droplets thus increasing interfacial area
View Answer
Explanation: The packing columns minimize the axial dispersion and help by increasing the mass transfer by breaking the large droplets thus increasing interfacial area.
4. Why is HETP larger than for staged devices?
a) To avoid overflow
b) To avoid back-mixing
c) To avoid the cost increment
d) To get full efficiency
View Answer
Explanation: To avoid back-mixing, HETP is larger for staged devices thus packed columns are used only when few stages are required.
5. What is the use of plate columns?
a) Increases axial mixing
b) Reduces axial mixing by packing columns
c) Reduces axial mixing and promotes a stage-wise type of contact
d) Reduces the cost
View Answer
Explanation: Since it is a shape of a plate, there is a stage-wise contact and also axial mixing is reduced.
6. Why are the extraction rates in sieve plate columns high?
a) Because the dispersed droplets coalesce and reform on each plate
b) Because the dispersed droplets don’t coalesce and reform on each plate
c) Because the dispersed droplets coalesce and not reform on each plate
d) Because the dispersed droplets neither coalesce nor reform on each plate
View Answer
Explanation: Since the dispersed droplets coalesce and reform on each plate, the extraction rates in sieve plate columns high.
7. How is agitation not induced in columns?
a) Oscillating pulse to liquid
b) Rotating agitators
c) By moving plates back and forth
d) By using mixers
View Answer
Explanation: Mixers are not used in columns.
8. How agitation is achieved in the scheibel column?
a) Liquid phases are contacted in fixed intervals by unbafled, flat bladed, turbine type agitators
b) By moving plates
c) By hands
d) Gravity separation
View Answer
Explanation: Liquid phases are contacted in fixed intervals by unbafled, flat bladed, turbine type agitators in scheibel column.
9. What type of agitator is rotating disk agitator?
a) Rotating agitator
b) By moving plates
c) By hands
d) Gravity separation
View Answer
Explanation: A disk agitator is a rotating agitator.
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