Refractory Technology problems
- 1. Vacuum steel degassing units are lined with
Options- A. silica bricks
- B. low duty firebricks
- C. high alumina bricks
- D. graphite blocks Discuss
Correct Answer: high alumina bricks
- 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
Correct Answer: reduced by the addition of acid oxides.
- 3. Roof of a basic electric furnace is made of __________ bricks.
Options- A. superduty fireclay
- B. silica
- C. chromite
- D. none of these Discuss
Correct Answer: silica
- 4. 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
Correct Answer: Sand
- 5. Hollow refractory bricks are made by
Options- A. slip casting
- B. hand moulding
- C. pressing/machine moulding
- D. extrusion Discuss
Correct Answer: slip casting
- 6. Which one expands on heating?
Options- A. Silica bricks
- B. Fireclay bricks
- C. Both (a) & (b)
- D. Neither (a) nor (b) Discuss
Correct Answer: Silica bricks
- 7. Outer combustion chamber of blast furnace stove is lined with __________ bricks.
Options- A. fireclay
- B. silica
- C. chrome magnesite
- D. zirconia Discuss
Correct Answer: fireclay
- 8. Refractories are dried in the
Options- A. rotary kilns
- B. tunnel kilns
- C. sun
- D. none of these Discuss
Correct Answer: tunnel kilns
- 9. 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
Correct Answer: both (b) and (c)
- 10. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the
Options- A. hearth of the blast furnace.
- B. nuclear reactors, missiles & space crafts.
- C. insulation of high temperature furnaces.
- D. roof of electric furnaces. Discuss
Correct Answer: nuclear reactors, missiles & space crafts.
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