Discussion
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- Question
Basic bricks are not made of
Options- A. fireclay
- B. magnesite
- C. foresterite
- D. chromite
- Correct Answer
- fireclay
- 1. Periclase is
Options- A. crystalline form of MgO.
- B. MgCO3.
- C. ZrSO4.
- D. amorphous magnesite. Discuss
- 2. Silliminite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in
Options- A. pottery furnace
- B. glass melting furnace
- C. crucibles
- D. gas retorts Discuss
- 3. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
Options- A. Soaking pits
- B. Ceheating furnace
- C. L.D. converter
- D. Rotary lime kiln Discuss
- 4. Cermets are
Options- A. composite material containing both ceramic & metallic constituents.
- B. having high strength & resistance to high temperature.
- C. used in space vehicles, missiles & nuclear energy plants.
- D. all (a), (b) and (c). Discuss
- 5. Which of the following does not occur during firing/burning of refractories?
Options- A. Removal of water of hydration.
- B. Vitrification.
- C. Decrease in crushing strength.
- D. Development of stable mineral form. Discuss
- 6. Chrome magnesite bricks are used in the
Options- A. side walls of soaking pits and arc furnaces.
- B. copper melting furnaces & converters.
- C. burner block of glass tanks.
- D. all (a), (b) and (c) Discuss
- 7. Ferromagnetic ceramic material is not used in the
Options- A. thermal insulation
- B. transformers
- C. magnetic switches
- D. television sets Discuss
- 8. Insulating refractories should have
Options- A. high porosity
- B. low thermal conductivity
- C. both (a) and (b)
- D. neither (a) not (b) Discuss
- 9. Cold crushing strength of a refractory does not depend upon its
Options- A. shape
- B. composition
- C. firing temperature
- D. texture Discuss
- 10. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
Options- A. 1520
- B. 1630
- C. 1670
- D. 1730 Discuss
Refractory Technology problems
Search Results
Correct Answer: crystalline form of MgO.
Correct Answer: gas retorts
Correct Answer: L.D. converter
Correct Answer: all (a), (b) and (c).
Correct Answer: Decrease in crushing strength.
Correct Answer: all (a), (b) and (c)
Correct Answer: thermal insulation
Correct Answer: low thermal conductivity
Correct Answer: shape
Correct Answer: 1730
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