Refractory Technology problems
- 1. 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
Correct Answer: fusion point.
- 2. 'Spinel', a refractory mineral is chemically represented as
Options- A. MgAl2O4
- B. MgAl2O3
- C. MgSO4
- D. MgAl2O3.2H2O Discuss
Correct Answer: MgAl2O4
- 3. 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
Correct Answer: all (a), (b) and (c).
- 4. Which brick undergoes maximum shrinkage on drying?
Options- A. Tar bonded dolomite bricks
- B. Fireclay bricks
- C. Magnesite bricks
- D. Chromite bricks Discuss
Correct Answer: Fireclay bricks
- 5. 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
Correct Answer: are not attacked by slags, as they are not wetted by melts.
- 6. Bauxite calcining rotary kilns are lined with __________ bricks.
Options- A. fireclay
- B. carbon
- C. 85% alumina
- D. corundum Discuss
Correct Answer: 85% alumina
- 7. __________ bricks are used in the burning zone of a cement rotary kiln.
Options- A. High alumina
- B. Fireclay
- C. Thoria
- D. Silicon carbide Discuss
Correct Answer: High alumina
- 8. 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
Correct Answer: both (b) and (c).
- 9. 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
Correct Answer: all (a), (b) and (c).
- 10. Mixing of ground refractory material and water is done in a __________ mill.
Options- A. pug
- B. ball
- C. tube
- D. rod Discuss
Correct Answer: pug
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