Chemical Engineering - Refractory Technology

46. 

Fireclay bricks is not used for lining the

A. cupola.
B. gas producer.
C. bottom of hot metal mixer.
D. roof of open hearth furnace.

Answer: Option C

Explanation:

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47. 

Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

A. 55
B. 70
C. 80
D. 90

Answer: Option D

Explanation:

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48. 

Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

A. fireclay
B. silica
C. dolomite
D. very low alumina

Answer: Option B

Explanation:

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49. 

Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to

A. thermal spalling
B. slag attack
C. fusion under load
D. CO attack

Answer: Option A

Explanation:

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50. 

Thermal spalling mainly occurs during __________ of furnaces.

A. cooling down
B. warming up
C. both (a) & (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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