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Chemical Engineering - Refractory Technology

Exercise

"Act well your part; there all honor lies."
- Alexander Pope
1. 

Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
A. non-wetting characteristic.
B. high thermal conductivity.
C. high crushing strength.
D. none of these.
2. 

Firing temperature of magnesite bricks is about __________ °C.
A. 800-1000B. 1000-1200
C. 1600-1800D. 2400-2600
3. 

Hollow refractory bricks are made by
A. slip casting
B. hand moulding
C. pressing/machine moulding
D. extrusion
4. 

Quartz is
A. stable form of silica upto 870°C.
B. converted to tridymite on firing between 870 to 1470°C.
C. transformed to crystoballite on heating above 1470°C.
D. all (a), (b) and (c).
5. 

An indication of degree of firing in silica brick is its
A. specific gravity
B. fusion point
C. RUL
D. none of these

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