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Chemical Engineering
‣
Refractory Technology
Comments
Question
Periclase refractory contains mainly
Options
A. CaO
B. MgO
C. Al
2
O
3
D. SiO
2
Correct Answer
MgO
Refractory Technology problems
Search Results
1. High density refractory bricks have lower
Options
A. spalling resistance.
B. thermal conductivity.
C. fusion point.
D. slag penetration resistance.
Show Answer
Scratch Pad
Discuss
Correct Answer: spalling resistance.
2. 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)
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c)
3. Maximum safe working temperature for fireclay bricks is about __________ °C.
Options
A. 1150
B. 1300
C. 1450
D. 1550
Show Answer
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Discuss
Correct Answer: 1550
4. Electrical resistor bars are made of
Options
A. silicon carbide
B. alumina
C. zirconia
D. graphite
Show Answer
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Discuss
Correct Answer: silicon carbide
5. 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).
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c).
6. 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).
Show Answer
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Discuss
Correct Answer: are used in the hearth of blast furnace.
7. 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.
Show Answer
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Discuss
Correct Answer: reduced by the addition of basic oxides.
8. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm
2
.
Options
A. 10
B. 100
C. 500
D. 1000
Show Answer
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Discuss
Correct Answer: 1000
9. Cold crushing strength of refractories depends upon its
Options
A. composition
B. texture
C. firing temperature
D. all (a), (b) and (c)
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c)
10. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: Tar bonded dolomite bricks
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