Discussion
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- Question
Hot face insulating linings of high purity alumina fused mullite are used, where
Options- A. very high temperatures are involved.
- B. highly reducing conditions are involved.
- C. presence of iron or silica is harmful.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. Magnesite refractories have low resistance to
Options- A. attack by basic slag.
- B. abrasion.
- C. disintegration on sudden change of temperature.
- D. both (b) and (c). Discuss
- 2. __________ bricks are used in the burning zone of a cement rotary kiln.
Options- A. High alumina
- B. Fireclay
- C. Thoria
- D. Silicon carbide Discuss
- 3. Bauxite calcining rotary kilns are lined with __________ bricks.
Options- A. fireclay
- B. carbon
- C. 85% alumina
- D. corundum Discuss
- 4. Carbon refractories
Options- A. do not burn/oxidise, when exposed to air on heating.
- B. are not attacked by slags, as they are not wetted by melts.
- C. do not resist temperature fluctuations.
- D. have extremely low thermal & electrical conductivities. Discuss
- 5. Which brick undergoes maximum shrinkage on drying?
Options- A. Tar bonded dolomite bricks
- B. Fireclay bricks
- C. Magnesite bricks
- D. Chromite bricks Discuss
- 6. Mixing of ground refractory material and water is done in a __________ mill.
Options- A. pug
- B. ball
- C. tube
- D. rod Discuss
- 7. Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?
Options- A. Firebricks
- B. Silica bricks
- C. Silicon carbide bricks
- D. Sillimanite Discuss
- 8. The largest consumer of refractories is the __________ industry.
Options- A. cement
- B. metallurgical
- C. fertiliser
- D. power Discuss
- 9. Porosity is induced in insulating refractories by adding
Options- A. powdered naphthalene.
- B. ammonium chloride/sulphate.
- C. calcium phosphate.
- D. all (a), (b) and (c). Discuss
- 10. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
Options- A. 10
- B. 15
- C. 20
- D. 30 Discuss
Refractory Technology problems
Search Results
Correct Answer: both (b) and (c).
Correct Answer: High alumina
Correct Answer: 85% alumina
Correct Answer: are not attacked by slags, as they are not wetted by melts.
Correct Answer: Fireclay bricks
Correct Answer: pug
Correct Answer: Silica bricks
Correct Answer: metallurgical
Correct Answer: all (a), (b) and (c).
Correct Answer: 30
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