Chemical Engineering - Refractory Technology

41. 

Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2 ) is __________ °C.

A. 500
B. 1000
C. >1350
D. >2000

Answer: Option C

Explanation:

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42. 

__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

A. High thermal conductivity
B. Low porosity
C. Non-wetting characteristics
D. High density

Answer: Option C

Explanation:

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43. 

Bauxite calcining rotary kilns are lined with __________ bricks.

A. fireclay
B. carbon
C. 85% alumina
D. corundum

Answer: Option C

Explanation:

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44. 

Use of higher percentage of lime for bonding silica bricks, reduces their

A. strength
B. abrasion resistance
C. both (a) & (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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45. 

Grog addition in fireclay during brick manufacture is done to

A. reduce its shrinkage on heating.
B. impart greater spalling resistance.
C. enhance the strength of fired refractories.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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