Chemical Engineering - Refractory Technology

6. 

In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

A. 700
B. 1000
C. 1600
D. 2000

Answer: Option C

Explanation:

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7. 

Which is not an acidic refractory ?

A. Silica
B. Fireclay
C. High alumina refractory
D. Carbon black

Answer: Option D

Explanation:

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8. 

Natural silica

A. mainly contains quartz.
B. is not stable at high temperature.
C. transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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9. 

Thermal conductivity of refractory bricks

A. increases with decrease in porosity.
B. decreases with decreases in porosity.
C. is independent of its porosity and is maximum for insulating bricks.
D. increases with the amount of air entrapped in pores.

Answer: Option A

Explanation:

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10. 

Dolomite bricks have good resistance to attack by

A. molten steel
B. iron oxide
C. lime slag
D. none of these

Answer: Option A

Explanation:

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