Chemical Engineering - Refractory Technology

1. 

__________ is not a single oxiderefractory.

A. Zirconia
B. Silicon carbide
C. Magnesia
D. None of these

Answer: Option B

Explanation:

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2. 

Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.

A. silica
B. fireclay
C. magnesite
D. zirconia

Answer: Option B

Explanation:

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3. 

High alumina refractory compared to fireclay bricks have

A. less load bearing capacity.
B. less resistance to slag attack.
C. low refractoriness.
D. high resistance to thermal shock and creep.

Answer: Option D

Explanation:

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4. 

Refractory bricks with lower permeability is produced by using

A. higher firing temperature.
B. higher moulding pressure.
C. finer grog size.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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5. 

Refractory bricks having lower porosity have

A. high insulating properties
B. low heat capacity
C. low thermal conductivity
D. greater strength

Answer: Option D

Explanation:

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