Chemical Engineering - Refractory Technology

16. 

Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called

A. spalling resistance.
B. refractoriness.
C. refractoriness under load (RUL).
D. none of these.

Answer: Option A

Explanation:

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17. 

Magnesite bricks are used in those parts of furnaces, which are

A. subjected to temperature fluctuation.
B. required to resist corrosive basic slag.
C. subjected to high load.
D. none of these.

Answer: Option B

Explanation:

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18. 

Which is not a basic refractory ?

A. Chrome magnesite
B. Magnesite
C. Dolomite
D. Silicon carbide

Answer: Option D

Explanation:

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19. 

Thoria

A. has high fusion temperature (> 3000°C) but poor resistance to thermal shock.
B. has high resistance to basic slags.
C. which is expensive & radioactive, is used in crucibles for melting high purity metals.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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20. 

Which property of refractories is the most important for top section of the blast furnace?

A. Resistance to abrasion.
B. Resistance to slag peneration.
C. Stability of volume at high temperature.
D. Resistance to corrosion by slag.

Answer: Option A

Explanation:

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