Chemical Engineering - Refractory Technology

11. 

Resistance to slag attack of a refractory

A. depends on the nature of slag & refractory.
B. decreases at higher temperature.
C. decreases, if defective joints & cracks exist in the refractory.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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12. 

Grog

A. contains both alumina and silica.
B. iscrushed firebrick.
C. is a non-plastic material.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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13. 

Test piece for determination of RUL of a refractory is heated in a/an

A. oxidising atmosphere
B. reducing atmosphere
C. electric furnace
D. neutral atmosphere

Answer: Option C

Explanation:

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14. 

Magnesite refractories are used for the construction of those furnaces, which are

A. not required to resist the corrosive action of basic slag.
B. not subjected to fluctuation in temperature.
C. used for raising & maintaining high temperature.
D. both (b) and (c)

Answer: Option D

Explanation:

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15. 

Roof of a basic electric furnace is made of __________ bricks.

A. superduty fireclay
B. silica
C. chromite
D. none of these

Answer: Option B

Explanation:

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