This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “Process Used for Coke Making”.
1. Which type of distillation is involved in Coke making?
a) Destructive distillation
b) Non-destructive distillation
c) Fractional distillation
d) Vacuum distillation
View Answer
Explanation: Coke making involves destructive distillation (carburization) of coal under controlled conditions and in the absence of air. The carbonisation conditions used in the coke ovens helps in determining the coke properties.
2. The first slot-type oven chamber was built during the ___________
a) Mid-19th century
b) Mid-18th century
c) Mid-20th century
d) Mid-17th century
View Answer
Explanation: The first slot-type oven chamber was built during the mid-19th century .The design of the ovens has been progressively improved. The design in use today in all conventional slot-type coke ovens is the modified version of the previous one.
3. Ovens are typically 400–600 mm wide, 1300–1400 mm long and 4 m to 7 m in height.
a) True
b) False
View Answer
Explanation: Ovens are typically 400–600 mm wide, 1300–1400 mm long and 4 m to 7 m in height. Each oven has two adjacent heating chambers on either side. Heating chamber raise the oven temperature to the desired centre coke mass temperature (around 1350°C).
4. Carbonisation typically takes _____________
a) 16–20 hours for completion
b) 6–28 hours for completion
c) 10–30 hours for completion
d) 6–20 hours for completion
View Answer
Explanation: Carbonisation typically complete in 16–20 hours. After completion Red hot coke is carefully pushed out through the opposite side. The ovens are called as by-product recovery coke ovens as along with coke, gas and liquids (like tar) are produced as by-products.
5. What forms a coke battery?
a) A series of slot-ovens in tandem
b) A slot-ovens
c) Voltaic cell
d) Chemical cell
View Answer
Explanation: A series of slot-ovens in tandem (typically 15–55 ovens) forms a coke battery. The ovens are called as by-product recovery coke ovens as along with coke, gas and liquids (like tar) are produced as by-products.
6. The non-recovery oven exhibits oven enclosure designs, preventing emission of exit gas.
a) True
b) False
View Answer
Explanation: The non-recovery oven exhibits oven enclosure designs, preventing emission of exit gas. This technique enhances the efficiency of the process by reducing the heat loss through hot gas emission.
7. Coke making can either be a part of an integrated steel plant or can be undertaken independently.
a) True
b) False
View Answer
Explanation: Coke making can either be a part of an integrated steel plant or can be undertaken independently. Today beside coke production, electricity is generated as a secondary product from heat recovered from the hot evolved waste gas. So coke making can be undertaken individually.
8. In non-recovery beehive oven the horizontal space requirement is at least 30–40% more than in the case of slot-oven batteries.
a) True
b) False
View Answer
Explanation: In non-recovery beehive ovens, the coking process proceeds vertically from the top of the coal charge downwards and from the bottom upwards instead of moving horizontally from the sides as in the case of slot ovens. This makes the coking chambers horizontal and of limited height.
9. The first set of non-recovery coke ovens were built in ___________
a) Vansant, USA, in the year 1989
b) Brazil, USA, in the year 1989
c) Vansant, USA, in the year 1950
d) Brazil, USA, in the year 1929
View Answer
Explanation: Coke making can either be a part of an integrated steel plant or can be undertaken independently. More ovens were added in Vansant and other places in the USA in the next ten years, for example, by Inland Steel in Chicago. Australia, Mexico and India have also installed non-recovery ovens.
10. Which oven is used to produce the coke of high-quality?
a) Non-recovery ovens
b) Recovery ovens
c) Regenerative ovens
d) Non-regenerative ovens
View Answer
Explanation: Coke of high-quality can be made in non-recovery ovens with CSR exceeding 72. Owing to the higher bulk density of the charge, higher operating temperatures and slower coking rates high-quality coke is obtained.
Sanfoundry Global Education & Learning Series – Iron Making.
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