Discussion
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- Question
Which form of silica has the highest specific gravity?
Options- A. Quartz
- B. Cristobalite
- C. Tridymite
- D. All have the same specific gravity
- Correct Answer
- Quartz
- 1. Which is an acidic refractory?
Options- A. Magnesite
- B. Dolomite
- C. Fireclay
- D. Chrome magnesite Discuss
- 2. Which is not an acidic refractory?
Options- A. Silica
- B. Fireclay
- C. High alumina refractory
- D. Carbon black Discuss
- 3. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.
Options- A. bakelite impregnated or fused periclase
- B. silica
- C. semi-silica
- D. fireclay Discuss
- 4. Thermal conductivity of refractory bricks
Options- A. increases with decrease in porosity.
- B. decreases with decreases in porosity.
- C. is independent of its porosity and is maximum for insulating bricks.
- D. increases with the amount of air entrapped in pores. Discuss
- 5. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in
Options- A. less shrinkage in heating, decreased apparent porosity & increased specific gravity.
- B. high strength & thermal spalling resistance.
- C. less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production.
- D. all (a), (b) and (c). Discuss
- 6. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
Options- A. 55
- B. 70
- C. 80
- D. 90 Discuss
- 7. Permeability of bricks is a measure of the
Options- A. refractoriness.
- B. melting point.
- C. rate at which a fluid will pass through the pores.
- D. expansion during heating. Discuss
- 8. Pyrometric cone equivalent (PCE) of a refractory is the measure of its
Options- A. spalling resistance.
- B. fusion point.
- C. resistance to slag penetration.
- D. resistance to carbon monoxide attack. Discuss
- 9. 'Spinel', a refractory mineral is chemically represented as
Options- A. MgAl2O4
- B. MgAl2O3
- C. MgSO4
- D. MgAl2O3.2H2O Discuss
- 10. Refractory castables are used for
Options- A. producing monolithic linings.
- B. patch work.
- C. minimising the number of joints in the structure.
- D. all (a), (b) and (c). Discuss
Refractory Technology problems
Search Results
Correct Answer: Fireclay
Correct Answer: Carbon black
Correct Answer: bakelite impregnated or fused periclase
Correct Answer: increases with decrease in porosity.
Correct Answer: all (a), (b) and (c).
Correct Answer: 90
Correct Answer: rate at which a fluid will pass through the pores.
Correct Answer: fusion point.
Correct Answer: MgAl2O4
Correct Answer: all (a), (b) and (c).
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