This set of Bioseparation Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Microfiltration”.
1. The microfiltration membrane retains the particles by ___________
a) molecular weight
b) sieving
c) pressure
d) dialysis
View Answer
Explanation: The membrane used for microfiltration retains the particles through sieving mechanism as the membranes used are micro-porous and it separates the micro-sized particles from fluids.
2. The typical permeate flux values are higher than __________ processes.
a) ultrafiltration
b) microfiltration
c) membrane filtration
d) nano-filtration
View Answer
Explanation: The process of ultrafiltration has less typical permeate flux values though the TMP is lower in the process of microfiltration.
3. The biotechnological applications of the microfiltration process are ________
a) cell harvesting
b) virus removal
c) cell harvesting and virus removal
d) filtration, cell harvesting and virus removal
View Answer
Explanation: The application of microfiltration is harvesting of cells from the bioreactor, removal of virus for the products of pharmaceuticals, clarification of beverages, purification of water, filtration of air, product sterilization.
4. The dead end filtration is used for ________ filtration.
a) water
b) air
c) solute
d) solution
View Answer
Explanation: the dead end filtration is the normal flow filtration process and is used for the filtration of air also used in removal of viruses and processes involved in the sterilization.
5. The applications apart from air filtration involve dead end filtration.
a) False
b) True
View Answer
Explanation: The applications apart from air filtration uses cross-flow microfiltration and not the dead end filtration.
6. The process of concentration polarization as well as membrane fouling is observed under ____ process.
a) ultrafiltration
b) microfiltration
c) membrane filtration
d) nano-filtration
View Answer
Explanation: The membrane used in microfiltration also undergoes the process of concentration polarization as well as membrane fouling and the particles being separated in microfiltration membrane have lower diffusivity when compared to the macromolecules.
7. The extent of any kind of back diffusion of the particles being separated using the microfiltration membrane into feed is not negligible.
a) False
b) True
View Answer
Explanation: The extent of any kind of back diffusion of the particles in feed in the microfiltration membrane is negligible as there is a very robust inclination of formation of cake.
8. In which process of membrane separation, the accumulated particles are brought back into the feed solution?
a) Ultrafiltration
b) Membrane filtration
c) Nano-filtration
d) Microfiltration
View Answer
Explanation: The particles accumulated in the process of membrane separation are brought back into the feed solution by the shear induction erosion of the cake in the process of microfiltration. The factors other than that like particles-particles interaction as well as the inertial lift forces accounts to the back-transport of the particles away from the membrane.
9. What is the common method for the removal of the formed cake from the membrane?
a) Pressure
b) Flux
c) Back flushing
d) Microfiltration
View Answer
Explanation: Back flushing is the common method for the reversal of material’s flow, characteristically liquids, that has developed contaminants and can remove it through a filtering system. It also removes the cake which is formed by the particles from the membrane.
10. The permeate flux in the process of microfiltration is given by _____ equation.
a) Jv = \(\frac{P}{\mu(R_M + R_C)}\)
b) Jv = \(\frac{\Delta P}{\mu(R_M – R_C)}\)
c) Jv = \(\frac{\Delta P}{(R_M + R_C)}\)
d) Jv = \(\frac{\Delta P}{\mu(R_M + R_C)}\)
View Answer
Explanation: The equation for permeate flux calculation in the process of microfiltration is given by Jv = \(\frac{\Delta P}{\mu(R_M + R_C)}\) where, RM is membrane resistance, RC is cake resistance, μ is the permeate viscosity and the cake resistance is given by RC = r \(\frac{V_s}{A_M}\) where, r is specific cake resistance, Vs is the volume of cake and AM is the area of membrane.
Sanfoundry Global Education & Learning Series – Bioseparation Engineering.
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