This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “General Constructional Features of Blast Furnace”.
1. Which of the following region the cylindrical portion located below the stack inside the Blast furnace?
a) Stack
b) Belly
c) Bosh
d) Hearth
View Answer
Explanation: The cylindrical portion inside the blast furnace located below the stack is called as Belly. This is second most regions in the blast furnace while going downwards. The temperature in this region is approximately 1200 degree centigrade.
2. While going downwards the walls inside the blast furnace slopes inside at _______
a) Stack
b) Belly
c) Bosh
d) Hearth
View Answer
Explanation: Bosh is the region located below the belly inside the blast furnace. The walls of Bosh region slopes inside while going downwards. The temperature inside the bosh region is of 1900 degree centigrade.
3. Which notch is located in upper region of blast furnace compared to others?
a) Clinder notch
b) Iron notch
c) Coke notch
d) Silica notch
View Answer
Explanation: Slag notch is also called as clinder notch. Slag is less dense than molten iron. This lower density of slag facilitates to flow over the molten iron which made the Clinder notch located in upper region.
4. The degradation of coke prior to insertion into blast furnace leads to__________
a) Increase in efficiency
b) Decrease in efficiency
c) Increase permeability inside BF
d) Makes no effect
View Answer
Explanation: The burden permeability in this region is mainly maintained by the presence of solid coke. Only coke of enough strength and ad equability should be used. Thus degradation leads to decrease in efficiency of operation.
5. The stack region expands progressively while going downwards the blast furnace because________
a) Freefall of charge material
b) Free allowance of air inside BF
c) Free slag removal is obtained
d) Gaunge easily mixes with flux
View Answer
Explanation: The increase in slope of BF while going downwards is obtained in Stack region. This facilitates the free fall of Charge material. Thus flow ability of blast furnace also increases inside blast furnace.
6. Which of the following is called as Deadman?
a) Coke in Stack region
b) Coke in belly region
c) Coke in Bosh region
d) Coke over hearth
View Answer
Explanation: Maximum amount of coke burns at tuyere level. The minute leftover coke on the hearth region is called as Deadman. This coke floats over hearth region where it’s dissolved into metal to its near saturation.
7. Which of the following is the smallest region in furnace?
a) Stack
b) Belly
c) Bosh
d) Hearth
View Answer
Explanation: Hearth is the last region in the blast furnace while going downwards and the walls are parallel to each other. The walls are sloped inwards while going downwards below belly region. This matters the density to facilitate in tapping section.
8. What is the major reason to decrease volume of the furnace at hearth region?
a) Density
b) Temperature
c) Cost
d) Low labor
View Answer
Explanation: The cross section of the furnace decreases below the tuyeres. At this part the liquids are dense without pores and voids. Thus low dense liquids lead to decrease the volume of furnace.
9. Working height is height from ____________
a) Stockline to tuyere
b) Belly to tuyere
c) Belly to hearth
d) Stack to hearth
View Answer
Explanation: The height from stock line to tuyere is called as working height. Stockline is the point at which the stock is inserted to start melting. Years have passed with many modifications but the working height hasn’t changed in many modern furnaces.
10. What factor is limiting the work volume in blast furnace?
a) Coke strength
b) Burden size
c) Burden cost
d) Temperature
View Answer
Explanation: Coke strength limits the working volume. The stronger the coke is, the more is the working volume. The required coke strength is off the limits which made to limit the working volume to an extent.
11. What factor of refractory prevents the damage of Stack region?
a) Withstand abrasion
b) Withstand high temperatures
c) Withstand attack of alkali
d) Withstand attack of limy slag
View Answer
Explanation: At the stack region the refractory must withstand abrasion. There is a need to withstand the effects caused by CO also. Where as in bosh region the refractory must withstand the attack of alkali.
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