Discussion
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- Question
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
- Correct Answer
- Sand
- 1. Roof of a basic electric furnace is made of __________ bricks.
Options- A. superduty fireclay
- B. silica
- C. chromite
- D. none of these Discuss
- 2. 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
- 3. Vacuum steel degassing units are lined with
Options- A. silica bricks
- B. low duty firebricks
- C. high alumina bricks
- D. graphite blocks Discuss
- 4. Panel test determines the __________ of refractories.
Options- A. fusion point
- B. spalling resistance
- C. slag penetration resistance
- D. refractoriness under load (RUL) Discuss
- 5. 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
- 6. Hollow refractory bricks are made by
Options- A. slip casting
- B. hand moulding
- C. pressing/machine moulding
- D. extrusion Discuss
- 7. Which one expands on heating?
Options- A. Silica bricks
- B. Fireclay bricks
- C. Both (a) & (b)
- D. Neither (a) nor (b) Discuss
- 8. Outer combustion chamber of blast furnace stove is lined with __________ bricks.
Options- A. fireclay
- B. silica
- C. chrome magnesite
- D. zirconia Discuss
- 9. Refractories are dried in the
Options- A. rotary kilns
- B. tunnel kilns
- C. sun
- D. none of these Discuss
- 10. Magnesite refractories are used for the construction of those furnaces, which are
Options- A. not required to resist the corrosive action of basic slag.
- B. not subjected to fluctuation in temperature.
- C. used for raising & maintaining high temperature.
- D. both (b) and (c) Discuss
Refractory Technology problems
Search Results
Correct Answer: silica
Correct Answer: reduced by the addition of acid oxides.
Correct Answer: high alumina bricks
Correct Answer: spalling resistance
Correct Answer: coke ovens regenerator.
Correct Answer: slip casting
Correct Answer: Silica bricks
Correct Answer: fireclay
Correct Answer: tunnel kilns
Correct Answer: both (b) and (c)
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