Chemical Engineering - Refractory Technology

21. 

Refractories used in/for __________ should have low thermal conductivity.

A. coke ovens
B. insulation
C. regenerators
D. muffle furnaces

Answer: Option B

Explanation:

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22. 

10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.

A. spalling resistance
B. refractoriness
C. crushing strength
D. resistance to slag

Answer: Option A

Explanation:

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23. 

Silica bricks are never used for lining the

A. beehive coke ovens.
B. by-product coke ovens.
C. dome of blast furnace stoves.
D. roof of open hearth furnace.

Answer: Option A

Explanation:

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24. 

Which is not a natural insulating material?

A. Diatomaceous earth/kieselgur
B. Asbestos
C. Vermiculite
D. None of these

Answer: Option D

Explanation:

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25. 

Magnesite refractories are generally not used in the

A. electric furnace walls.
B. steel melting furnace.
C. open hearth furnace.
D. burning zone of cement kilns.

Answer: Option B

Explanation:

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