This set of Bioseparation Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Membrane Processes”.
1. Pressure driven membrane based separation process are classified based on ___________
a) permeable species
b) membrane
c) flux
d) fouling
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Explanation: The bioseparation process that are based on the pressure are subdivided on the basis of the permeable membrane and specifically the size of the species.
2. The pressure driven bioseparation is divided into ___________ categories based on size of permeable species.
a) 2
b) 3
c) 4
d) 5
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Explanation: The four various types of pressure driven membrane based bioseparation processes are microfiltration, ultrafiltration, Nano-filtration and reverse osmosis.
3. What is the fifth type of membrane based bioseparation method?
a) Microfiltration
b) Dialysis
c) Adsorption
d) Filtration
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Explanation: Dialysis is not based on the pressure for the separation of the particles like other four processes that are based on the pressure for the separation therefore it is the fifth type of process.
4. Dialysis is based on ____________ driven process for the separation of the particles through membrane.
a) pressure
b) size
c) diffusion
d) sedimentation
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Explanation: The process of dialysis is based on the diffusion or the concentration gradient of particles from the region of higher concentration to the region of lower concentration in the presence of a semipermeable membrane.
5. Dialysis is similar to which process of bioseparation?
a) Microfiltration
b) Nano-filtration
c) Ultrafiltration
d) Reverse osmosis
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Explanation: The dialysis process allows solutes of similar type to pass through the membrane as the solutes passes through the Nano-filtration, the only difference is one is diffusion driven and other is size driven.
6. Which process is used for the separation of fine particles?
a) Microfiltration
b) Ultrafiltration
c) Nano-filtration
d) Concentration gradient
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Explanation: Microfiltration uses trans-membrane pressure of 1-50 psig which is suitable for the separation of fine particles.
7. The membrane used in the microfiltration captures the particles by ____________
a) adsorption
b) sedimentation
c) surface filtration
d) diffusion
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Explanation: The surface of the membranes i.e., surface filtration are used for the process of microfiltration but sometimes in some cases even depth filtration can be used for capturing the particle.
8. Clarification is performed by ___________
a) microfiltration
b) ultrafiltration
c) nano-filtration
d) concentration gradient
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Explanation: The process of microfiltration are used very commonly in sterilization, clarification and concentration of slurry.
9. Which process uses symmetric membrane?
a) Ultrafiltration
b) Nano-filtration
c) Microfiltration
d) Dialysis
View Answer
Explanation: Microfiltration only uses symmetric membrane rest all others have asymmetric membrane i.e. composite membrane.
10. Which process of membrane separation retains the macromolecules
a) Ultrafiltration
b) Nano-filtration
c) Microfiltration
d) Dialysis
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Explanation: The process of ultrafiltration retains the proteins which allows the smaller molecule to pass through and is used to separate large molecules from solvent, from smaller molecules and from one another.
11. What is the primary separation mechanism of ultrafiltration?
a) Dialysis
b) Adsorption
c) Size exclusion
d) Electrophoresis
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Explanation: The process of ultrafiltration works on the principle of size exclusion chromatography also has features of physicochemical interactions among the membrane as well as solutes and the operating conditions.
12. Which method allows salts to pass through the membrane?
a) Ultrafiltration
b) Nano-filtration
c) Microfiltration
d) Dialysis
View Answer
Explanation: The process of Nano-filtration allows the small molecules as well as salts to pass through the membrane and retains the larger molecules like hormones, peptides etc.
13. Which method allows the water to go through the membrane?
a) Ultrafiltration
b) Nano-filtration
c) Microfiltration
d) Reverse osmosis
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Explanation: The process of reverse osmosis retains the dissolved species and allows the water to to flow through the membrane in the feed.
14. In reverse osmosis, the water travels from lower solute concentration to higher solute concentration.
a) True
b) False
View Answer
Explanation: In the process of osmosis, the water travels from lower solute concentration to higher solute concentration while in the process of reverse osmosis, the reverse of the above process takes place due to the presence of trans-membrane pressure.
Sanfoundry Global Education & Learning Series – Bioseparation Engineering.
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