Chemical Engineering - Refractory Technology

11. 

Porosity of silica bricks varies from __________ percent.

A. 5 to 10
B. 20 to 30
C. 45 to 60
D. 60 to 75

Answer: Option B

Explanation:

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12. 

Colour of fireclay bricks is

A. light buff to reddish buff
B. yellow
C. black
D. none of these

Answer: Option A

Explanation:

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13. 

Rate of slag attack on refractories increases with rise in temperature due to the

A. decreased viscosity of slag.
B. increased thermal conductivity of brick.
C. oxidising condition in the furnace.
D. none of these.

Answer: Option A

Explanation:

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14. 

Which of the following is not a high alumina refractory material ?

A. Kyanite
B. Sillimanite
C. Diaspore
D. Periclase

Answer: Option D

Explanation:

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15. 

Magnesite chrome bricks are used in the

A. roof lining of basic open hearth & other basic furnaces.
B. reheating furnaces.
C. soaking pits.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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