Refractory Technology problems
- 1. Semi-silica bricks compared to silica bricks have
Options- A. less fusion point.
- B. better spalling resistance.
- C. both (a) and (b).
- D. neither (a) not (b). Discuss
Correct Answer: both (a) and (b).
- 2. Rate of slag attack on refractories increases with rise in temperature due to the
Options- A. decreased viscosity of slag.
- B. increased thermal conductivity of brick.
- C. oxidising condition in the furnace.
- D. none of these. Discuss
Correct Answer: decreased viscosity of slag.
- 3. Chrome magnesite brick is not used for lining the
Options- A. hearth of soaking pits.
- B. bottom hearth of reheating furnace.
- C. coke oven regenerator.
- D. burning zone of limestone rotary kilns. Discuss
Correct Answer: coke oven regenerator.
- 4. To resist spalling tendency, a refractory should have
Options- A. greater diffusivity.
- B. low specific heat.
- C. low thermal co-efficient of expansion.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 5. Grog addition in fireclay during brick manufacture is done to
Options- A. reduce its shrinkage on heating.
- B. impart greater spalling resistance.
- C. enhance the strength of fired refractories.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 6. Roof of a basic open hearth furnace is lined with __________ bricks.
Options- A. silica
- B. fireclay
- C. dolomite
- D. magnesite Discuss
Correct Answer: silica
- 7. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves?
Options- A. High refractoriness.
- B. High resistance to spalling.
- C. High strength and density.
- D. All (a), (b) and (c). Discuss
Correct Answer: High refractoriness.
- 8. Spalling tendency of refractories is reduced by increasing its
Options- A. porosity
- B. specific gravity
- C. thermal conductivity
- D. strength Discuss
Correct Answer: porosity
- 9. Colour of fireclay bricks is
Options- A. light buff to reddish buff
- B. yellow
- C. black
- D. none of these Discuss
Correct Answer: light buff to reddish buff
- 10. Which is the stable form of silica upto 1470°C?
Options- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. None of these Discuss
Correct Answer: Tridymite
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