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- Question
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
- Correct Answer
- Beryllia
- 1. Silica bricks are never used for lining the
Options- A. beehive coke ovens.
- B. by-product coke ovens.
- C. dome of blast furnace stoves.
- D. roof of open hearth furnace. Discuss
- 2. Magnesite chrome refractories
Options- A. have better spalling resistance than chrome magnesite refractories.
- B. have very low thermal co-efficient of expansion.
- C. are not at all resistant to the corrosive action of iron oxide.
- D. have very low (50 kg/cm2 ) cold crushing strength (C.C.S.), and can not be used in metalcase form. Discuss
- 3. Dolomite bricks have good resistance to attack by
Options- A. molten steel
- B. iron oxide
- C. lime slag
- D. none of these Discuss
- 4. Pick out the wrong statement.
Options- A. Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks.
- B. Graphite refractories are also called plumbago refractories.
- C. Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
- D. Calcined magnesite is also called dead burnt magnesite. Discuss
- 5. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of
Options- A. fireclay
- B. silicon carbide
- C. corrundum
- D. siliceous fireclay Discuss
- 6. 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
- 7. 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
- 8. Which is a neutral refractory?
Options- A. Graphite
- B. Magnesite chrome
- C. Silica
- D. Magnesia Discuss
- 9. Thermal spalling mainly occurs during __________ of furnaces.
Options- A. cooling down
- B. warming up
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 10. __________ bricks should not be used in oxidising atmosphere.
Options- A. Tar dolomite
- B. Carbon
- C. Silica
- D. Fireclay Discuss
Refractory Technology problems
Search Results
Correct Answer: beehive coke ovens.
Correct Answer: have better spalling resistance than chrome magnesite refractories.
Correct Answer: molten steel
Correct Answer: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
Correct Answer: silicon carbide
Correct Answer: Ceramic materials do not undergo vitrification on heating.
Correct Answer: both (b) and (c)
Correct Answer: Graphite
Correct Answer: both (a) & (b)
Correct Answer: Carbon
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