Refractory Technology problems
- 1. __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.
Options- A. High thermal conductivity
- B. Low porosity
- C. Non-wetting characteristics
- D. High density Discuss
Correct Answer: Non-wetting characteristics
- 2. Magnesite bricks have poor resistance to attack by __________ slag.
Options- A. lime
- B. basic
- C. acid
- D. none of these Discuss
Correct Answer: acid
- 3. Porosity of silica bricks varies from __________ percent.
Options- A. 5 to 10
- B. 20 to 30
- C. 45 to 60
- D. 60 to 75 Discuss
Correct Answer: 20 to 30
- 4. Carbon refractories are exclusively used in the
Options- A. hearth of blast furnace.
- B. walls of coke oven.
- C. regenerators of coke oven.
- D. side wall of soaking pits. Discuss
Correct Answer: hearth of blast furnace.
- 5. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2 ) is __________ °C.
Options- A. 500
- B. 1000
- C. >1350
- D. >2000 Discuss
Correct Answer: >1350
- 6. Which of the following is not a high alumina refractory material?
Options- A. Kyanite
- B. Sillimanite
- C. Diaspore
- D. Periclase Discuss
Correct Answer: Periclase
- 7. Porosity of fireclay refractories is __________ percent.
Options- A. 5-10
- B. 10-25
- C. 25-35
- D. 35-50 Discuss
Correct Answer: 10-25
- 8. Which one contains minimum percentage of SiO2?
Options- A. Firebrick
- B. Sillimanite
- C. Semi-silica
- D. Aluminous firebrick Discuss
Correct Answer: Sillimanite
- 9. Zirconia refractories are not used in
Options- A. making sheaths for thermocouple.
- B. lining high temperature ceramic kilns.
- C. furnaces subjected to fluctuating temperature.
- D. high frequency induction furnaces in the form of inductors. Discuss
Correct Answer: furnaces subjected to fluctuating temperature.
- 10. With decrease in porosity, the __________ of the refractories decreases.
Options- A. strength
- B. thermal conductivity
- C. spalling resistance
- D. none of these Discuss
Correct Answer: spalling resistance
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