Discussion
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- Question
Vacuum steel degassing units are lined with
Options- A. silica bricks
- B. low duty firebricks
- C. high alumina bricks
- D. graphite blocks
- Correct Answer
- high alumina bricks
- 1. Panel test determines the __________ of refractories.
Options- A. fusion point
- B. spalling resistance
- C. slag penetration resistance
- D. refractoriness under load (RUL) Discuss
- 2. Fireclay bricks are used in the
Options- A. coke ovens regenerator.
- B. outer lining of L.D. converter.
- C. hearth bottom of blast furnace.
- D. coke oven walls. Discuss
- 3. Firing temperature of magnesite bricks is about __________ °C.
Options- A. 800-1000
- B. 1000-1200
- C. 1600-1800
- D. 2400-2600 Discuss
- 4. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
Options- A. 770
- B. 570
- C. 270
- D. 70 Discuss
- 5. Maximum alumina content in high alumina refractory can be as high as __________ percent.
Options- A. 30
- B. 50
- C. 70
- D. 90 Discuss
- 6. Fusion point of a basic refractory material is
Options- A. reduced by the addition of acid oxides.
- B. increased by the addition of acid oxides.
- C. not affected by the addition of acid oxides.
- D. always less than 1000°C. Discuss
- 7. Roof of a basic electric furnace is made of __________ bricks.
Options- A. superduty fireclay
- B. silica
- C. chromite
- D. none of these Discuss
- 8. An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
Options- A. Cork
- B. Saw dust
- C. Sand
- D. Chemically prepared foam Discuss
- 9. Hollow refractory bricks are made by
Options- A. slip casting
- B. hand moulding
- C. pressing/machine moulding
- D. extrusion Discuss
- 10. Which one expands on heating?
Options- A. Silica bricks
- B. Fireclay bricks
- C. Both (a) & (b)
- D. Neither (a) nor (b) Discuss
Refractory Technology problems
Search Results
Correct Answer: spalling resistance
Correct Answer: coke ovens regenerator.
Correct Answer: 1600-1800
Correct Answer: 270
Correct Answer: 90
Correct Answer: reduced by the addition of acid oxides.
Correct Answer: silica
Correct Answer: Sand
Correct Answer: slip casting
Correct Answer: Silica bricks
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