Engineering Questions with Answers - Multiple Choice Questions
Separation Processes MCQ’s – Separations by External Field or Gradient
1 - Question
How is the separation of uranium isotopes carried out?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
View Answer
Explanation: Centrifugation helps separation of isotopes based on molecular weights.
2 - Question
How is the separation of chlorine isotopes carried out?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
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Explanation: Thermal diffusion helps in the separation of chlorine isotopes.
3 - Question
Which separation technique is used to concentrate heavy water?
a) Centrifugation
b) Electrodialysis
c) Electrolysis
d) Thermal diffusion
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Explanation: Electrolysis is the technique used to concentrate heavy water.
4 - Question
Which separation technique is used for desalinization of sea water?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
View Answer
Explanation: Electrodialysis is used in desalinization of sea water.
5 - Question
How are hemicelluloses recovered?
a) Centrifugation
b) Electrophoresis
c) Electrolysis
d) Thermal diffusion
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Explanation: Electrophoresis is used in recovering of hemicelluloses.
6 - Question
What field is applied in fled-flow fractionation?
a) Thermal gradient
b) Centrifugal force field
c) Perpendicular electric or magnetic field
d) Parallel electric or magnetic field
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Explanation: A perpendicular electric or magnetic field is applied to the laminar flow.
7 - Question
What do the cation and anion permeable membrane do in electro-dialysis?
a) Disallows migration of species of same charge
b) Facilitates the migration of species of same charge
c) Separates the protons and electrons
d) Removes the ions
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Explanation: A cation or anion membrane carries a fixed charge that prevents the migration of species of same charge.
8 - Question
What happens when a temperature gradient is applied?
a) Components flow at different rates
b) Charged components migrate to opposite sides
c) The high melting component melts
d) Concentration gradient is formed
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Explanation: A concentration gradient is formed due to temperature that gives the separation using thermal diffusion.
9 - Question
What is the role of centrifugal force field?
a) Establishes a magnetic field
b) Establishes a pressure filed
c) Establishes an electric field
d) Settles down the heavier particles
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Explanation: The centrifugal filed establishes a pressure field that separates fluid mixtures according to molecular weights.
10 - Question
Why is an external field or gradient applied?
a) To increase the speed of separation
b) To start the separation
c) To decrease the byproducts
d) To obtain maximum efficiency
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Explanation: The external field is not employed to increase efficiency or speed but it is the driving force in the separation.