1. . The flux used in blast furnace while melting iron ore is:
e) Bauxite
(A) Carbon
(B) Oxygen
(C) Sodium chloride
(D) Limestone
2. . For each ton of pig iron produced in a blast furnace, the amount of ore used is approximately:
e) 12.5 tons
(A) 1 ton
(B) 2 tons
(C) 5 tons
(D) 13 tons
3. . For each ton of pig iron produced from blast furnace, the limestone used is approximately:
e) 2.55 tons
(A) 0.01 ton
(B) 0.1 ton
(C) 0.4 ton
(D) 1.4 ton
4. . For each ton of pig iron produced in blast furnace, the quantity of coke required would be roughly:
e) 1.9 ton
(A) 0.1 ton
(B) 0.25 ton
(C) 0.5 ton
(D) 1.4 ton
5. . Which of the following is by-product from blast furnace?
e) None of the above
(A) Slag
(B) Flue dust
(C) Blast furnace gas
(D) All of the above
6. . The maximum temperature inside a blast furnace is of the order of:
e) 3600°C
(A) 50°C
(B) 1000°C
(C) 1600°C
(D) 2600°C
7. . Percentage of iron in pig iron approximately:
e) 78%
(A) 99.90%
(B) 95%
(C) 90%
(D) 80%
8. . Which of the following is easiest to bend?
e) Wrought iron
(A) Cast iron
(B) Grey pig iron
(C) Mottled pig iron
(D) Steel
9. . Which of the following gives granular fracture?
e) None of the above
(A) Steel
(B) Wrought iron
(C) Cast iron
(D) All of the above
10. . Dilute nitric acid applied to a clean fracture of wrought iron gives:
e) Black stain
(A) White stain
(B) Greenish stain
(C) Blue stain
(D) Grey stain