Chemical Engineering - Refractory Technology

31. 

Which one expands on heating ?

A. Silica bricks
B. Fireclay bricks
C. Both (a) & (b)
D. Neither (a) nor (b)

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

32. 

Refractoriness/fusion points of 'superduty' refractories is __________ °C.

A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000

Answer: Option C

Explanation:

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33. 

Outer combustion chamber of blast furnace stove is lined with __________ bricks.

A. fireclay
B. silica
C. chrome magnesite
D. zirconia

Answer: Option A

Explanation:

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34. 

Presence of MgO in alumino-silicate refractories __________ its refractoriness.

A. increases
B. lowers
C. does not affect
D. either (a) or (b); depends on its quantity

Answer: Option B

Explanation:

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35. 

Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

A. 770
B. 570
C. 270
D. 70

Answer: Option C

Explanation:

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