Chemical Engineering - Refractory Technology

11. 

Sillimanite is a __________ refractory.

A. basic
B. neutral
C. high alumina
D. insulating

Answer: Option C

Explanation:

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12. 

High refractorinness of refractory bricks means, that it has a

A. high spalling resistance.
B. low spalling resistance.
C. high resistance to fusion.
D. low porosity.

Answer: Option C

Explanation:

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13. 

Conversion of silica mineral to cristobalite is accompanied by reduction in its

A. volume
B. specific gravity
C. both (a) & (b)
D. neither (a) nor (b)

Answer: Option B

Explanation:

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14. 

Chrome magnesite is not used in the

A. inner lining of L.D. converter.
B. aluminium melting furnaces.
C. wear out lining of steel melting furnaces.
D. all (a), and (b) and (c)

Answer: Option C

Explanation:

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15. 

Which of the following bricks has the most close values of RUL and PCE ?

A. Silica bricks
B. Fireclay bricks
C. High alumina bricks
D. Tar dolomite bricks

Answer: Option A

Explanation:

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