Chemical Engineering - Refractory Technology

16. 

Which is not a high alumina refractory ?

A. Mullite
B. Corrundum
C. Bauxite
D. Dolomite

Answer: Option D

Explanation:

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17. 

Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.

A. Beryllia
B. Carborundum
C. Corundum
D. Thoria

Answer: Option A

Explanation:

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18. 

Faster rate of drying of moulded refractories results in high __________ of refractories.

A. green strength
B. voids
C. shrinkage
D. both (b) and (c)

Answer: Option D

Explanation:

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19. 

Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.

A. preheating
B. cooling
C. burning
D. all

Answer: Option C

Explanation:

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20. 

The highest melting pure oxide (m.p. > 3000°C)is

A. thoria
B. alumina
C. beryllia
D. zirconia

Answer: Option A

Explanation:

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