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Chemical Engineering
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Refractory Technology
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Question
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
Options
A. 1800
B. 2200
C. 2400
D. 2700
Correct Answer
2700
Refractory Technology problems
Search Results
1. Carbon refractories have very high
Options
A. wetting characteristics
B. refractoriness
C. thermal conductivity
D. both (b) and (c)
Show Answer
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Discuss
Correct Answer: both (b) and (c)
2. Which furnace consumes maximum refractory annually in an integrated steel plant?
Options
A. Soaking pit
B. Blastfurnace
C. L.D. converter
D. Coke ovens
Show Answer
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Discuss
Correct Answer: L.D. converter
3. High refractorinness of refractory bricks means, that it has a
Options
A. high spalling resistance.
B. low spalling resistance.
C. high resistance to fusion.
D. low porosity.
Show Answer
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Discuss
Correct Answer: high resistance to fusion.
4. The main raw material for manufacture of silicon carbide refractories is
Options
A. corrundum
B. carborundum
C. bauxite
D. periclase
Show Answer
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Discuss
Correct Answer: carborundum
5. Sillimanite is a __________ refractory.
Options
A. basic
B. neutral
C. high alumina
D. insulating
Show Answer
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Discuss
Correct Answer: high alumina
6. Chrome magnesite bricks are
Options
A. acidic in nature.
B. neutral in nature.
C. having higher RUL than silica bricks.
D. made by mixing 30% chromite and 70% periclase.
Show Answer
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Discuss
Correct Answer: having higher RUL than silica bricks.
7. Which of the following bricks has the most close values of RUL and PCE?
Options
A. Silica bricks
B. Fireclay bricks
C. High alumina bricks
D. Tar dolomite bricks
Show Answer
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Correct Answer: Silica bricks
8. Silica bricks have low spalling resistance below 600°C, due to its
Options
A. very high thermal conductivity.
B. high co-efficient of expansion upto this temperature.
C. high thermal diffusivity.
D. low refractoriness.
Show Answer
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Discuss
Correct Answer: high co-efficient of expansion upto this temperature.
9. Pick out the wrong statement.
Options
A. Sand & coke is the main raw material for the manufacture of silicon carbide.
B. Carbon refractories can not be used in the furnaces operating under reducing conditions.
C. Mullite can be obtained by the heating of alusite, kyanite or silimanite.
D. Silica occurs in nature in all cellular, amorphous or crystalline form.
Show Answer
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Discuss
Correct Answer: Carbon refractories can not be used in the furnaces operating under reducing conditions.
10. Carbon bricks are not used in the lining of the
Options
A. combustion chamber of blast furnace stoves.
B. electric furnaces.
C. highly chemical resistant equipments.
D. blast furnace hearth.
Show Answer
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Discuss
Correct Answer: combustion chamber of blast furnace stoves.
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