Separation Processes Questions and Answers Part-1

1. Which manner is a chemical or biochemical plant not operated in?
a) Continuous
b) Batch-wise
c) Semi-continuous
d) Discontinuous

Answer: d
Explanation: If a chemical plant is operated in a discontinuous manner, time will be illogically wasted.

2. When is a separation process not required in a manufacturing process?
a) When there is a decomposition reaction
b) When there is a complete conversion
c) When the byproducts are in form of gases
d) When the reaction is reversible

Answer: b
Explanation: If there is a complete conversion of reactants to products, there will be no need for separation since no reactants are left.

3. If only 5% of Ethylene is converted to Ethylene glycol, why is there a need of separation process?
a) To feed more reactant to the reacting mixture
b) To remove the ethylene glycol formed
c) To recover the unreacted Ethylene Glycol
d) To start an intermediate reaction

Answer: c
Explanation: If the unreacted reactant is reused the cost of the manufacturing in turn shall be reduced since there will be less requirement for feeding new reactant and near complete conversion could be achieved.

4. How is the Diethyl Ether removed in the manufacturing of ethanol from ethylene?
a) Directly removed
b) Crude distillation column
c) Low pressure flash drum
d) Light-ends tower

Answer: d
Explanation: Diethyl ether is removed using a light ends tower easily.

5. Chemical reactions require feed mixtures from non-renewable resources like coal, petroleum. What is used in place of non-renewable sources?
a) Sunlight
b) Biomass
c) Biodiesel
d) Microorganisms

Answer: b
Explanation: Many of the products given by coal, petroleum are given by biomass too and it is less polluting.

6. Which of the following is a condition of operation for biochemical plant?
a) Metallic catalyst
b) Chemical catalyst
c) Elevated temperature
d) Non-pathologic state of the organism

Answer: d
Explanation: If any condition is used in a biochemical plant then there are chances of the organisms dying.So a nn-pathological state is preferred.

7. In a biochemical plant, what do the physiological conditions vary with?
a) The reaction
b) State of the products
c) The micro-organism
d) The ambient conditions

Answer: c
Explanation: The physiological condition has to be dependent on the micro-organism because micro-organism activity can be maximsed at certain conditions only

8. How can be citric acid produced other than from lemons?
a) Aerobic fermentation of starch
b) Anaerobic fermentation of starch
c) Aerobic fermentation of glucose
d) Anaerobic fermentation of glucose

Answer: a
Explanation: The aerobic fermentation gives a considerate amount of citric acid required in various chemical and biochemical reactions.

9. Which of the following separation techniques is NOT used in the process of manufacturing of citric acid ?
a) Ultrafiltration
b) Ion-exchange
c) Crystallization
d) Distillation

Answer: d
Explanation: Distillation is not required in the manufacturing of itric acid since there are no two products forming which are needed to be separated having difference in boiling points.

10. What separation technique is used when a separation operation is accompanied by chemical reaction that facilitates separation?
a) Distillation
b) Fractional distillation
c) Reactive distillation
d) Fractional crystallization

Answer: c
Explanation: Reactive distillation is best employed in such conditions when the separation process is accompanied by chemical reaction like absorption of SO2 by limestone slurry.