Discussion
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- Question
Which is not a natural insulating material?
Options- A. Diatomaceous earth/kieselgur
- B. Asbestos
- C. Vermiculite
- D. None of these
- Correct Answer
- None of these
- 1. Refractory bricks with lower permeability is produced by using
Options- A. higher firing temperature.
- B. higher moulding pressure.
- C. finer grog size.
- D. all (a), (b) and (c). Discuss
- 2. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
Options- A. 80 and 20
- B. 20 and 80
- C. 50 and 50
- D. 60 and 40 Discuss
- 3. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
Options- A. thermal spalling
- B. slag attack
- C. fusion under load
- D. CO attack Discuss
- 4. Carborundum used for making crucibles for melting non-ferrous metals is chemically
Options- A. silicon carbide
- B. silicon nitride
- C. crystalline magnesia
- D. zirconium sulphate Discuss
- 5. Magnesite refractories are generally not used in the
Options- A. electric furnace walls.
- B. steel melting furnace.
- C. open hearth furnace.
- D. burning zone of cement kilns. Discuss
- 6. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
Options- A. chrome or magnesite
- B. silicon carbide
- C. silica
- D. lowduty fireclay Discuss
- 7. Fireclay bricks are not used in the
Options- A. blast furnace
- B. hot blast stove
- C. cupola
- D. wall of coke oven Discuss
- 8. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in
Options- A. less shrinkage in heating, decreased apparent porosity & increased specific gravity.
- B. high strength & thermal spalling resistance.
- C. less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production.
- D. all (a), (b) and (c). Discuss
- 9. Thermal conductivity of refractory bricks
Options- A. increases with decrease in porosity.
- B. decreases with decreases in porosity.
- C. is independent of its porosity and is maximum for insulating bricks.
- D. increases with the amount of air entrapped in pores. Discuss
- 10. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.
Options- A. bakelite impregnated or fused periclase
- B. silica
- C. semi-silica
- D. fireclay Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: 80 and 20
Correct Answer: thermal spalling
Correct Answer: silicon carbide
Correct Answer: steel melting furnace.
Correct Answer: chrome or magnesite
Correct Answer: wall of coke oven
Correct Answer: all (a), (b) and (c).
Correct Answer: increases with decrease in porosity.
Correct Answer: bakelite impregnated or fused periclase
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