Discussion
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- Question
Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?
Options- A. Tar bonded dolomite bricks
- B. Fireclay bricks
- C. Mullite bricks
- D. Magnesite bricks
- Correct Answer
- Tar bonded dolomite bricks
- 1. Cold crushing strength of refractories depends upon its
Options- A. composition
- B. texture
- C. firing temperature
- D. all (a), (b) and (c) Discuss
- 2. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
Options- A. 10
- B. 100
- C. 500
- D. 1000 Discuss
- 3. Fusion point of an acidic refractory material is
Options- A. increased by the addition of basic oxides.
- B. reduced by the addition of basic oxides.
- C. not affected by the addition of basic oxides.
- D. always more than 2500°C. Discuss
- 4. Carbon refractory blocks
Options- A. are wetted by molten iron.
- B. are used in the hearth of blast furnace.
- C. are acidic in nature.
- D. all (a), (b) and (c). Discuss
- 5. Periclase refractory contains mainly
Options- A. CaO
- B. MgO
- C. Al2O3
- D. SiO2 Discuss
- 6. Which is a basic refractory?
Options- A. Fireclay
- B. Silica
- C. Chrome magnesite
- D. None of these Discuss
- 7. Silicon carbide refractories are used in the
Options- A. muffle furnace
- B. zinc smelting furnace
- C. ceramic recuperators
- D. all (a), (b) and (c) Discuss
- 8. Which is not a high alumina refractory?
Options- A. Mullite
- B. Corrundum
- C. Bauxite
- D. Dolomite Discuss
- 9. Ramming masses are used for
Options- A. obtaining monolithic working faces.
- B. repairing construction of various furnace parts.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 10. __________ is the measure of the strength of refractory under the combined effect of temperature & load.
Options- A. Porosity
- B. RUL
- C. Specific gravity
- D. Thermal conductivity Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c)
Correct Answer: 1000
Correct Answer: reduced by the addition of basic oxides.
Correct Answer: are used in the hearth of blast furnace.
Correct Answer: MgO
Correct Answer: Chrome magnesite
Correct Answer: all (a), (b) and (c)
Correct Answer: Dolomite
Correct Answer: both (a) & (b).
Correct Answer: RUL
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