Chemical Engineering - Refractory Technology

21. 

Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.

A. 2-3
B. 5-7
C. 7-12
D. 14-20

Answer: Option D

Explanation:

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22. 

Fireclay bricks are never used in the

A. beehive oven
B. coke oven walls
C. zinc roaster
D. lead blast furnace

Answer: Option B

Explanation:

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23. 

With increasing alumina content, the fusion point of high alumina refractories

A. increases.
B. decreases.
C. remains constant.
D. may increase or decrease ; depends on its alumina content.

Answer: Option A

Explanation:

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24. 

Chrome magnesite bricks are used in the

A. side walls of soaking pits and arc furnaces.
B. copper melting furnaces & converters.
C. burner block of glass tanks.
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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25. 

Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.

A. 10
B. 100
C. 500
D. 1000

Answer: Option D

Explanation:

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