Refractory Technology problems
- 1. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
Options- A. Beryllia
- B. Carborundum
- C. Corundum
- D. Thoria Discuss
Correct Answer: Beryllia
- 2. Pick out the wrong statement.
Options- A. A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous state is termed s glass.
- B. Ceramic materials do not undergo vitrification on heating.
- C. Ceramic materials are brittle in nature.
- D. Non-oxide ceramic materials generally act as a semi-conductor. Discuss
Correct Answer: Ceramic materials do not undergo vitrification on heating.
- 3. Faster rate of drying of moulded refractories results in high __________ of refractories.
Options- A. green strength
- B. voids
- C. shrinkage
- D. both (b) and (c) Discuss
Correct Answer: both (b) and (c)
- 4. Which is a neutral refractory?
Options- A. Graphite
- B. Magnesite chrome
- C. Silica
- D. Magnesia Discuss
Correct Answer: Graphite
- 5. Thermal spalling mainly occurs during __________ of furnaces.
Options- A. cooling down
- B. warming up
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 6. __________ bricks should not be used in oxidising atmosphere.
Options- A. Tar dolomite
- B. Carbon
- C. Silica
- D. Fireclay Discuss
Correct Answer: Carbon
- 7. With increase in the density of silica refractories, its
Options- A. resistance to slag attack increases.
- B. spalling resistance reduces.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) and (b).
- 8. Fireclay bricks is not used for lining the
Options- A. cupola.
- B. gas producer.
- C. bottom of hot metal mixer.
- D. roof of open hearth furnace. Discuss
Correct Answer: bottom of hot metal mixer.
- 9. Fusion temperature of pure silica (SiO2) is __________ °C.
Options- A. 1350
- B. 1715
- C. 2570
- D. 2800 Discuss
Correct Answer: 1715
- 10. __________ is not a single oxiderefractory.
Options- A. Zirconia
- B. Silicon carbide
- C. Magnesia
- D. None of these Discuss
Correct Answer: Silicon carbide
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