Chemical Engineering - Refractory Technology

26. 

Which is an acidic refractory ?

A. Magnesite
B. Dolomite
C. Fireclay
D. Chrome magnesite

Answer: Option C

Explanation:

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27. 

Carborundum used for making crucibles for melting non-ferrous metals is chemically

A. silicon carbide
B. silicon nitride
C. crystalline magnesia
D. zirconium sulphate

Answer: Option A

Explanation:

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28. 

Which of the following impurities reduces the refractoriness of magnesite bricks ?

A. Al2O3
B. CaO
C. SiO2
D. all (a), (b) & (c)

Answer: Option D

Explanation:

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29. 

Crushing strength of a refractory

A. increases with rise in service temperature.
B. decreases with rise in service temperature.
C. is unaffected with change in service temperature.
D. decreases with increase in porosity.

Answer: Option B

Explanation:

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30. 

Ramming masses are used for

A. obtaining monolithic working faces.
B. repairing construction of various furnace parts.
C. both (a) & (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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