This set of Engineering Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Carbonization of Coal”.
1. All types of coals can be converted into coke.
a) True
b) False
View Answer
Explanation: All types of coals cannot be converted into coke. Only that coal which has a tendency to soften, swell and stick together during strong heating in absence of air can be coked.
2. The process of converting coal into coke is called ______
a) Coking
b) Carbonization
c) Decarbonization
d) Isomerization
View Answer
Explanation: The process of converting coal into coke is called carbonization. When coking coal is heated in absence of air, porous, strong and hard residue left is called coke.
3. Depending on the behaviour of the coal, when it is heated in the absence of air, it can be categorized into ______ categories.
a) 2
b) 3
c) 4
d) 5
View Answer
Explanation: Depending on the behaviour of the coal, when it is heated in the absence of air, it can be categorized into 2 categories, Coking and Non-coking coals.
4. Which coals are suitable for metallurgical purposes?
a) Coking
b) Carburized
c) Non-coking
d) Decarburized
View Answer
Explanation: Coking coals are suitable for metallurgical purposes because they are quite strong and not crushed under the weight of ore.
5. Only bituminous type of coal can be coked.
a) True
b) False
View Answer
Explanation: Only that coal which has tendency to soften, swell and stick together during strong heating in absence of air can be coked. This property is found only in the bituminous type of coal.
6. Caking coal with ______ content are used for gas manufacturer.
a) high volatile matter
b) low volatile matter
c) high ash content
d) high moisture content
View Answer
Explanation: Caking coal with high volatile matter content are used for gas manufacture whereas caking coal with low moisture matter content is used for the manufacturing of metallurgical coke.
7. Practically, coking coals are blended with ______
a) caking coals
b) non-caking coals
c) non-coking coals
d) lignite
View Answer
Explanation: Coking coals are blended with non-caking coals since it helps in increasing the rate of carbonization and producing good quality coke from non-caking coal.
8. Select the correct statement among the given below.
a) All coking coals are caking but not all caking coals are coking
b) All caking coals are coking but not all coking coals are caking
c) Coking and caking are the same types of coals
d) All types of coals can be coked
View Answer
Explanation: All coking coals are caking but not all caking coals are coking.Only that coal which has a tendency to soften, swell and stick together during strong heating in absence of air can be coked.
9. Coals which become soft, plastic and fuse together to form large coherent masses are called ______
a) caking coals
b) non-caking coals
c) non-coking coals
d) pulverized coal
View Answer
Explanation: Coals which becomes soft, plastic and fuse together to form large coherent masses are called caking coals. Coals which undergo no fusing affects are called non-coking coals. Coking coals give hard, porous and strong residue after heating in absence of air.
10. When a coking coal is burnt in absent of air, hard, strong and porous residue left is called as _____
a) Coke
b) Ash
c) Caking coal
d) Non-coking coal
View Answer
Explanation: When a coking coal is burnt in absent of air, hard, strong and porous residue left is called coke. Coke is white, lustrous, dense, porous and coherent mass.
Sanfoundry Global Education & Learning Series – Engineering Chemistry.
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