Separations by External Field or Gradient Questions and Answers

This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Separations by External Field or Gradient”.

1. How is the separation of uranium isotopes carried out?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
View Answer

Answer: a
Explanation: Centrifugation helps separation of isotopes based on molecular weights.

2. How is the separation of chlorine isotopes carried out?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
View Answer

Answer: d
Explanation: Thermal diffusion helps in the separation of chlorine isotopes.

3. Which separation technique is used to concentrate heavy water?
a) Centrifugation
b) Electrodialysis
c) Electrolysis
d) Thermal diffusion
View Answer

Answer: c
Explanation: Electrolysis is the technique used to concentrate heavy water.

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4. Which separation technique is used for desalinization of sea water?
a) Centrifugation
b) Electrodialysis
c) Electrophoresis
d) Thermal diffusion
View Answer

Answer: b
Explanation: Electrodialysis is used in desalinization of sea water.

5. How are hemicelluloses recovered?
a) Centrifugation
b) Electrophoresis
c) Electrolysis
d) Thermal diffusion
View Answer

Answer: b
Explanation: Electrophoresis is used in recovering of hemicelluloses.

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6. 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
View Answer

Answer: c
Explanation: A perpendicular electric or magnetic field is applied to the laminar flow.

7. 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
View Answer

Answer: a
Explanation: A cation or anion membrane carries a fixed charge that prevents the migration of species of same charge.

8. 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
View Answer

Answer: d
Explanation: A concentration gradient is formed due to temperature that gives the separation using thermal diffusion.

9. 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
View Answer

Answer: b
Explanation: The centrifugal filed establishes a pressure field that separates fluid mixtures according to molecular weights.

10. 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
View Answer

Answer: b
Explanation: The external field is not employed to increase efficiency or speed but it is the driving force in the separation.

Sanfoundry Global Education & Learning Series – Separation Processes.

To practice all areas of Separation Processes, here is complete set of 1000+ Multiple Choice Questions and Answers.

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