Chemical Engineering - Refractory Technology

31. 

Bottom of basic open hearth furnace are constructed of

A. dead burnt magnesite ramming mass.
B. porous fireclay bricks.
C. semi-silica bricks.
D. silicon carbide bricks.

Answer: Option A

Explanation:

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32. 

Which form of silica has the highest specific gravity ?

A. Quartz
B. Cristobalite
C. Tridymite
D. All have the same specific gravity

Answer: Option A

Explanation:

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33. 

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of

A. fireclay
B. silicon carbide
C. corrundum
D. siliceous fireclay

Answer: Option B

Explanation:

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34. 

__________ is the measure of the strength of refractory under the combined effect of temperature & load.

A. Porosity
B. RUL
C. Specific gravity
D. Thermal conductivity

Answer: Option B

Explanation:

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35. 

Fireclay bricks are not used in the

A. blast furnace
B. hot blast stove
C. cupola
D. wall of coke oven

Answer: Option D

Explanation:

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