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- Question
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
- Correct Answer
- Agree
- 1. The fuel used in a blast furnace is
Options- A. coal
- B. coke
- C. wood
- D. producer gas Discuss
- 2. The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is
Options- A. elasticity
- B. plasticity
- C. ductility
- D. malleability Discuss
- 3. Aluminium bronze has high resistance to corrosion.
Options- A. True
- B. False Discuss
- 4. Manganese bronze has
Options- A. good wearing qualities and high elasticity
- B. high yield point, high fatigue limit and excellent cold and hot corrosion resistance
- C. high resistance to corrosion
- D. valuable cold working property Discuss
- 5. Muntz metal (Yellow brass) contains
Options- A. 70% copper and 30% zinc
- B. 60% copper and 40% zinc
- C. 59% copper, 40% zinc and 1% tin
- D. 60.45% copper, 35.2% zinc and 5.35% nickel Discuss
- 6. The heat treatment process used for castings is
Options- A. carburising
- B. normalising
- C. annealing
- D. tempering Discuss
- 7. 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
- 8. 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
- 9. 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 Discuss
- 10. 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
Engineering Materials problems
Search Results
Correct Answer: coke
Correct Answer: plasticity
Correct Answer: False
Correct Answer: high resistance to corrosion
Correct Answer: 60% copper and 40% zinc
Correct Answer: normalising
Correct Answer: all of the above
Correct Answer: lower critical point
Correct Answer: forms a slag by combining with impurities
Correct Answer: none of the above
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