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Chemical Engineering
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Refractory Technology
Comments
Question
Electrical resistor bars are made of
Options
A. silicon carbide
B. alumina
C. zirconia
D. graphite
Correct Answer
silicon carbide
Refractory Technology problems
Search Results
1. 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
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
2. 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.
Show Answer
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Discuss
Correct Answer: at the hearth bottom of the furnace on which stock is placed.
3. Si percentage in silica refractories used in the walls of coke oven is about
Options
A. 45
B. 60
C. 80
D. 95
Show Answer
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Discuss
Correct Answer: 95
4. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ? 0.5 percent.
Options
A. fireclay
B. silica
C. magnesite
D. corundum
Show Answer
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Discuss
Correct Answer: fireclay
5. Fireclay bricks are never used in the
Options
A. beehive oven
B. coke oven walls
C. zinc roaster
D. lead blast furnace
Show Answer
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Discuss
Correct Answer: coke oven walls
6. 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
7. 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)
8. High density refractory bricks have lower
Options
A. spalling resistance.
B. thermal conductivity.
C. fusion point.
D. slag penetration resistance.
Show Answer
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Discuss
Correct Answer: spalling resistance.
9. Periclase refractory contains mainly
Options
A. CaO
B. MgO
C. Al
2
O
3
D. SiO
2
Show Answer
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Discuss
Correct Answer: MgO
10. 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
Scratch Pad
Discuss
Correct Answer: are used in the hearth of blast furnace.
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