Discussion
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- Question
Lower part of hot metal mixer are lined with __________ bricks.
Options- A. superduty fireclay
- B. high alumina
- C. silica
- D. carborundum
- Correct Answer
- carborundum
- 1. Segar cones are used for the determination of __________ of refractories.
Options- A. softening temperature
- B. spalling resistance
- C. electrical conductivity
- D. resistance to slag attack Discuss
- 2. Which of the following has the lowest electrical resistivity?
Options- A. Graphite
- B. Fireclay
- C. Alumina
- D. Zircon Discuss
- 3. Silica refractories are not used in
Options- A. coke oven walls.
- B. beehive coke ovens.
- C. dome and upper portion of B.F. stoves.
- D. open hearth furnace roof. Discuss
- 4. Carbon bricks are not used in the lining of the
Options- A. combustion chamber of blast furnace stoves.
- B. electric furnaces.
- C. highly chemical resistant equipments.
- D. blast furnace hearth. Discuss
- 5. Pick out the wrong statement.
Options- A. Sand & coke is the main raw material for the manufacture of silicon carbide.
- B. Carbon refractories can not be used in the furnaces operating under reducing conditions.
- C. Mullite can be obtained by the heating of alusite, kyanite or silimanite.
- D. Silica occurs in nature in all cellular, amorphous or crystalline form. Discuss
- 6. Pick out the wrong statement.
Options- A. Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
- B. Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators.
- C. Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity.
- D. Electrical conductivity of porous refractory material is low. Discuss
- 7. Pick out the wrong statement.
Options- A. Fluxing material like lime is added in clay to reduce the vitrification temperature.
- B. Main constituents of clay are alumina and silica.
- C. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and reduces its shrinkage on burning.
- D. Vitrification of fireclay material is done to increase its porosity. Discuss
- 8. Refractory materials are never used in the construction of
Options- A. segar cones
- B. orton cones
- C. pressure vessels
- D. ovens & retorts Discuss
- 9. Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
Options- A. mortars
- B. cements
- C. castables
- D. none of these Discuss
- 10. Fireclay bricks are used in the
Options- A. furnaces allowed to cool frequently
- B. flues
- C. chimney linings
- D. all (a), (b) and (c) Discuss
Refractory Technology problems
Search Results
Correct Answer: softening temperature
Correct Answer: Graphite
Correct Answer: beehive coke ovens.
Correct Answer: combustion chamber of blast furnace stoves.
Correct Answer: Carbon refractories can not be used in the furnaces operating under reducing conditions.
Correct Answer: Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
Correct Answer: Vitrification of fireclay material is done to increase its porosity.
Correct Answer: pressure vessels
Correct Answer: castables
Correct Answer: all (a), (b) and (c)
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