Chemical Engineering - Refractory Technology

16. 

Si percentage in silica refractories used in the walls of coke oven is about

A. 45
B. 60
C. 80
D. 95

Answer: Option D

Explanation:

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17. 

Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?

A. aluminium phosphate
B. water
C. lime
D. plaster of paris

Answer: Option B

Explanation:

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18. 

High thermal conductivity of a refractory material is not important, when it is to be used in the

A. coke oven regenarators
B. muffle furnace
C. blast furnace
D. recuperators

Answer: Option C

Explanation:

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19. 

Maximum safe working temperature for fireclay bricks is about __________ °C.

A. 1150
B. 1300
C. 1450
D. 1550

Answer: Option D

Explanation:

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20. 

Ferromagnetic ceramic material is not used in the

A. thermal insulation
B. transformers
C. magnetic switches
D. television sets

Answer: Option A

Explanation:

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