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Chemical Engineering
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Refractory Technology
Comments
Question
Cermets are
Options
A. composite material containing both ceramic & metallic constituents.
B. having high strength & resistance to high temperature.
C. used in space vehicles, missiles & nuclear energy plants.
D. all (a), (b) and (c).
Correct Answer
all (a), (b) and (c).
Refractory Technology problems
Search Results
1. Which of the following does not occur during firing/burning of refractories?
Options
A. Removal of water of hydration.
B. Vitrification.
C. Decrease in crushing strength.
D. Development of stable mineral form.
Show Answer
Scratch Pad
Discuss
Correct Answer: Decrease in crushing strength.
2. With increasing alumina content, the fusion point of high alumina refractories
Options
A. increases.
B. decreases.
C. remains constant.
D. may increase or decrease ; depends on its alumina content.
Show Answer
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Discuss
Correct Answer: increases.
3. Zirconia refractory
Options
A. does not react with basic slags.
B. is produced from baddeleyite.
C. can not be used as an insulator.
D. has poor electrical conductivity at high temperature.
Show Answer
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Discuss
Correct Answer: is produced from baddeleyite.
4. Alumina-graphite bricks are used for lining the
Options
A. slide gate in teeming laddies.
B. continuous casting systems.
C. both (a) and (b).
D. neither (a) nor (b).
Show Answer
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Discuss
Correct Answer: both (a) and (b).
5. Spalling resistance of a refractory can not be increased by
Options
A. increasing its porosity.
B. using a coarser grog during its manufacture.
C. decreasing its thermal co-efficient of expansion.
D. making it denser.
Show Answer
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Discuss
Correct Answer: making it denser.
6. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
Options
A. Soaking pits
B. Ceheating furnace
C. L.D. converter
D. Rotary lime kiln
Show Answer
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Discuss
Correct Answer: L.D. converter
7. Silliminite (Al
2
O
3
.SiO
2
) refractory, which is a neutral refractory, is not used in
Options
A. pottery furnace
B. glass melting furnace
C. crucibles
D. gas retorts
Show Answer
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Discuss
Correct Answer: gas retorts
8. Periclase is
Options
A. crystalline form of MgO.
B. MgCO
3
.
C. ZrSO
4
.
D. amorphous magnesite.
Show Answer
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Discuss
Correct Answer: crystalline form of MgO.
9. Basic bricks are not made of
Options
A. fireclay
B. magnesite
C. foresterite
D. chromite
Show Answer
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Discuss
Correct Answer: fireclay
10. Chrome magnesite bricks are used in the
Options
A. side walls of soaking pits and arc furnaces.
B. copper melting furnaces & converters.
C. burner block of glass tanks.
D. all (a), (b) and (c)
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c)
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