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Chemical Engineering
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Refractory Technology
Comments
Question
Fireclay bricks are never used in the
Options
A. beehive oven
B. coke oven walls
C. zinc roaster
D. lead blast furnace
Correct Answer
coke oven walls
Refractory Technology problems
Search Results
1. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
Options
A. aluminium phosphate
B. water
C. lime
D. plaster of paris
Show Answer
Scratch Pad
Discuss
Correct Answer: water
2. High thermal conductivity of a refractory material is not important, when it is to be used in the
Options
A. coke oven regenarators
B. muffle furnace
C. blast furnace
D. recuperators
Show Answer
Scratch Pad
Discuss
Correct Answer: blast furnace
3. Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
Options
A. 2-3
B. 5-7
C. 7-12
D. 14-20
Show Answer
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Discuss
Correct Answer: 14-20
4. Which one contains maximum percentage of Al
2
O
3
?
Options
A. Firebrick
B. Sillimanite
C. Magnesite
D. Aluminous firebrick
Show Answer
Scratch Pad
Discuss
Correct Answer: Sillimanite
5. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
Options
A. 1520
B. 1630
C. 1670
D. 1730
Show Answer
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Discuss
Correct Answer: 1730
6. 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
7. 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
8. 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.
9. 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).
10. Electrical resistor bars are made of
Options
A. silicon carbide
B. alumina
C. zirconia
D. graphite
Show Answer
Scratch Pad
Discuss
Correct Answer: silicon carbide
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