Discussion
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- Question
Which brick undergoes maximum shrinkage on drying?
Options- A. Tar bonded dolomite bricks
- B. Fireclay bricks
- C. Magnesite bricks
- D. Chromite bricks
- Correct Answer
- Fireclay bricks
- 1. Refractory castables are used for
Options- A. producing monolithic linings.
- B. patch work.
- C. minimising the number of joints in the structure.
- D. all (a), (b) and (c). Discuss
- 2. 'Spinel', a refractory mineral is chemically represented as
Options- A. MgAl2O4
- B. MgAl2O3
- C. MgSO4
- D. MgAl2O3.2H2O Discuss
- 3. Pyrometric cone equivalent (PCE) of a refractory is the measure of its
Options- A. spalling resistance.
- B. fusion point.
- C. resistance to slag penetration.
- D. resistance to carbon monoxide attack. Discuss
- 4. Permeability of bricks is a measure of the
Options- A. refractoriness.
- B. melting point.
- C. rate at which a fluid will pass through the pores.
- D. expansion during heating. Discuss
- 5. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
Options- A. 55
- B. 70
- C. 80
- D. 90 Discuss
- 6. 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
- 7. Bauxite calcining rotary kilns are lined with __________ bricks.
Options- A. fireclay
- B. carbon
- C. 85% alumina
- D. corundum Discuss
- 8. __________ bricks are used in the burning zone of a cement rotary kiln.
Options- A. High alumina
- B. Fireclay
- C. Thoria
- D. Silicon carbide Discuss
- 9. 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
- 10. 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). Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: MgAl2O4
Correct Answer: fusion point.
Correct Answer: rate at which a fluid will pass through the pores.
Correct Answer: 90
Correct Answer: are not attacked by slags, as they are not wetted by melts.
Correct Answer: 85% alumina
Correct Answer: High alumina
Correct Answer: both (b) and (c).
Correct Answer: all (a), (b) and (c).
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