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- Question
The limestone in the charge of a blast furnace decomposes to give lime and carbon dioxide. The lime thus obtained
Options- A. controls the grade of pig iron
- B. acts as an iron-bearing mineral
- C. supplies heat to reduce ore and melt the iron
- D. forms a slag by combining with impurities
- Correct Answer
- forms a slag by combining with impurities
- 1. The temperature point at which the change starts on heating the steel is called
Options- A. lower critical point
- B. upper critical point
- C. point of recalescence
- D. point of decalescence Discuss
- 2. The slag from the blast furnace
Options- A. is used as a ballast for rail road
- B. is mixed with tar for road making
- C. consists of calcium, aluminium and ferrous silicates
- D. all of the above Discuss
- 3. The heat treatment process used for castings is
Options- A. carburising
- B. normalising
- C. annealing
- D. tempering Discuss
- 4. During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising.
Options- A. Agree
- B. Disagree Discuss
- 5. The fuel used in a blast furnace is
Options- A. coal
- B. coke
- C. wood
- D. producer gas Discuss
- 6. Which of the following statement is wrong?
Options- A. The spheroidising process is usually applied to high carbon tool steels which are difficult to machine
- B. In spheroidising process, the cementite in the granular form is produced in the structure of steel
- C. The annealing process causes complete recrystallisation in steels which have been severely cold worked and a new grain structure is formed
- D. none of the above Discuss
- 7. The portion of the blast furnace above its widest cross-section is called
Options- A. hearth
- B. stack
- C. bosh
- D. throat Discuss
- 8. Face centred cubic space lattice is found in gamma-iron, aluminium, copper, lead, silver and nickel.
Options- A. True
- B. False Discuss
- 9. The slow cooling of steel from the __________ results in a coarse grained structure.
Options- A. lower critical point
- B. upper critical point Discuss
- 10. In corrosion resistant properties, bronzes are __________ to brasses.
Options- A. superior
- B. inferior Discuss
Engineering Materials problems
Search Results
Correct Answer: lower critical point
Correct Answer: all of the above
Correct Answer: normalising
Correct Answer: Agree
Correct Answer: coke
Correct Answer: none of the above
Correct Answer: stack
Correct Answer: True
Correct Answer: upper critical point
Correct Answer: superior
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