This set of Fluidization Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Gasification of Coal and Coke”.
1. Winker gas generator, was the first commercial application of the fluidized bed for chemical operations, true or false?
a) True
b) False
View Answer
Explanation: It was first developed as an idea which was later fabricated for industrial purpose.
2. What is the mesh size of coal used in winker gas generator?
a) <8
b) >8
c) <16
d) >16
View Answer
Explanation: Since it provides better fluidization than the other ranges.
3. What is the gas used for fluidizing the coal feed?
a) Steam
b) Air
c) Oxygen
d) All of the mentioned
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Explanation: The mixture of Steam-air-oxygen is utilized for generating the required conditions.
4. After having a hot environment in the chamber, what is released?
a) Carbon dioxide
b) Volatile matter
c) Oxygen
d) Water vapour
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Explanation: Materials with low boiling point get evaporated in the furnace.
5. Where is the volatile matter used as raw gas?
a) Chemical synthesis
b) Cracking
c) Pyrolysis
d) All of the mentioned
View Answer
Explanation: Used to produce ammonia and methyl alcohol.
6. Why does winker gas generator does not produce enough amount of synthetic gas?
a) Temperature is kept below 1000 Celsius
b) Temperature is kept above 1000 Celsius
c) Pressure is kept at 1 atm
d) None of the mentioned
View Answer
Explanation: To prevent sintering of ash.
7. When temperature is kept below 1000 Celsius, what happens in the process?
a) Leads to insufficient cracking of methane
b) Leads to sufficient cracking of methane
c) Leads to sufficient cracking of ethane
d) Leads to insufficient cracking of ethane
View Answer
Explanation: Oxygen is not sufficient for cracking hence reducing 5 to 7 vol%.
8. What is done in order to prevent insufficient cracking of methane?
a) Secondary oxygen
b) Secondary nitrogen
c) Secondary carbon dioxide
d) All of the mentioned
View Answer
Explanation: Secondary oxygen is injected just above the bed, causing combustion.
9. What happens when we inject secondary oxygen for combustion?
a) Raises temperature above 1000 Celsius
b) Maintains temperature at 1000 Celsius
c) Reduces further below 1000 Celsius
d) None of the mentioned
View Answer
Explanation: Increasing the temperature will help in cracking methane.
10. What is another problem apart from methane cracking in winker gas generator?
a) Carbon loss
b) Corrosion
c) Insufficient air supply
d) All of the mentioned
View Answer
Explanation: 20 to 30% of carbon is being lost by entrainment.
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