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- Question
Tar bonded dolomite bricks
Options- A. are stored under controlled temperature & humidity to avoid hydration.
- B. are used in outer lining of L.D. converters.
- C. have poorer hydration resistance than pitch bonded bricks.
- D. all (a), (b) and (c)
- Correct Answer
- all (a), (b) and (c)
- 1. Maximum safe working temperature for fireclay bricks is about __________ °C.
Options- A. 1150
- B. 1300
- C. 1450
- D. 1550 Discuss
- 2. Electrical resistor bars are made of
Options- A. silicon carbide
- B. alumina
- C. zirconia
- D. graphite Discuss
- 3. Zircon refractories have
Options- A. low co-efficient of expansion.
- B. high RUL (1600°C) and refractoriness (> 2000°C).
- C. high spalling resistance.
- D. all (a), (b) and (c). Discuss
- 4. Refractoriness under load (RUL) is the most important property for the refractory bricks
Options- A. at the hearth bottom of the furnace on which stock is placed.
- B. used for furnace insulation.
- C. used in the roof of the furnace.
- D. none of these. Discuss
- 5. Si percentage in silica refractories used in the walls of coke oven is about
Options- A. 45
- B. 60
- C. 80
- D. 95 Discuss
- 6. High density refractory bricks have lower
Options- A. spalling resistance.
- B. thermal conductivity.
- C. fusion point.
- D. slag penetration resistance. Discuss
- 7. Periclase refractory contains mainly
Options- A. CaO
- B. MgO
- C. Al2O3
- D. SiO2 Discuss
- 8. 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
- 9. 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
- 10. 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
Refractory Technology problems
Search Results
Correct Answer: 1550
Correct Answer: silicon carbide
Correct Answer: all (a), (b) and (c).
Correct Answer: at the hearth bottom of the furnace on which stock is placed.
Correct Answer: 95
Correct Answer: spalling resistance.
Correct Answer: MgO
Correct Answer: are used in the hearth of blast furnace.
Correct Answer: reduced by the addition of basic oxides.
Correct Answer: 1000
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