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Home
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Chemical Engineering
‣
Refractory Technology
Comments
Question
Which one contains minimum percentage of SiO
2
?
Options
A. Firebrick
B. Sillimanite
C. Semi-silica
D. Aluminous firebrick
Correct Answer
Sillimanite
Refractory Technology problems
Search Results
1. Porosity of fireclay refractories is __________ percent.
Options
A. 5-10
B. 10-25
C. 25-35
D. 35-50
Show Answer
Scratch Pad
Discuss
Correct Answer: 10-25
2. Which of the following is not a high alumina refractory material?
Options
A. Kyanite
B. Sillimanite
C. Diaspore
D. Periclase
Show Answer
Scratch Pad
Discuss
Correct Answer: Periclase
3. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm
2
) is __________ °C.
Options
A. 500
B. 1000
C. >1350
D. >2000
Show Answer
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Discuss
Correct Answer: >1350
4. Carbon refractories are exclusively used in the
Options
A. hearth of blast furnace.
B. walls of coke oven.
C. regenerators of coke oven.
D. side wall of soaking pits.
Show Answer
Scratch Pad
Discuss
Correct Answer: hearth of blast furnace.
5. Porosity of silica bricks varies from __________ percent.
Options
A. 5 to 10
B. 20 to 30
C. 45 to 60
D. 60 to 75
Show Answer
Scratch Pad
Discuss
Correct Answer: 20 to 30
6. Zirconia refractories are not used in
Options
A. making sheaths for thermocouple.
B. lining high temperature ceramic kilns.
C. furnaces subjected to fluctuating temperature.
D. high frequency induction furnaces in the form of inductors.
Show Answer
Scratch Pad
Discuss
Correct Answer: furnaces subjected to fluctuating temperature.
7. With decrease in porosity, the __________ of the refractories decreases.
Options
A. strength
B. thermal conductivity
C. spalling resistance
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: spalling resistance
8. An ideal refractory should have high
Options
A. spalling rate
B. fusion point
C. shrinkage ability
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: fusion point
9. Highest melting (m.p = 3070°C) oxide refractory is
Options
A. alumina
B. thoria
C. zirconia
D. magnesia
Show Answer
Scratch Pad
Discuss
Correct Answer: thoria
10. SiO
2
percentage in firebrick is about
Options
A. 35-40
B. 55-60
C. 80-85
D. >94
Show Answer
Scratch Pad
Discuss
Correct Answer: 55-60
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