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- Question
Thoria
Options- A. has high fusion temperature (> 3000°C) but poor resistance to thermal shock.
- B. has high resistance to basic slags.
- C. which is expensive & radioactive, is used in crucibles for melting high purity metals.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. Quartz is
Options- A. stable form of silica upto 870°C.
- B. converted to tridymite on firing between 870 to 1470°C.
- C. transformed to crystoballite on heating above 1470°C.
- D. all (a), (b) and (c). Discuss
- 2. An indication of degree of firing in silica brick is its
Options- A. specific gravity
- B. fusion point
- C. RUL
- D. none of these Discuss
- 3. Thermal diffusivity of a refractory brick is high, when its __________ is high.
Options- A. density
- B. specific heat
- C. thermal conductivity
- D. none of these Discuss
- 4. With increase in the alumina content, the refractoriness of high alumina refractories
Options- A. increases
- B. decreases
- C. remains same
- D. may increase or decrease Discuss
- 5. Grog
Options- A. contains both alumina and silica.
- B. iscrushed firebrick.
- C. is a non-plastic material.
- D. all (a), (b) and (c). Discuss
- 6. Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.
Options- A. 1520
- B. 1630
- C. 1670
- D. 1730 Discuss
- 7. Hot metal runner in blast furnace are lined with __________ bricks.
Options- A. silica
- B. carborundum
- C. fireclay
- D. magnesite Discuss
- 8. Refractoriness/fusion points of 'superduty' refractories is __________ °C.
Options- A. 1520-1630
- B. 1630-1670
- C. > 1730
- D. > 2000 Discuss
- 9. Test piece for determination of RUL of a refractory is heated in a/an
Options- A. oxidising atmosphere
- B. reducing atmosphere
- C. electric furnace
- D. neutral atmosphere Discuss
- 10. Chromite refractories
Options- A. are bonded with lime and clay.
- B. (free from silica) have better thermal fatigue resistance than silica and magnesite refractories.
- C. are resistant to basic slag.
- D. all (a), (b) and (c). Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: specific gravity
Correct Answer: thermal conductivity
Correct Answer: increases
Correct Answer: all (a), (b) and (c).
Correct Answer: 1730
Correct Answer: fireclay
Correct Answer: > 1730
Correct Answer: electric furnace
Correct Answer: all (a), (b) and (c).
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