Chemical Engineering - Refractory Technology

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1.
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
non-wetting characteristic.
high thermal conductivity.
high crushing strength.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

2.
Firing temperature of magnesite bricks is about __________ °C.
800-1000
1000-1200
1600-1800
2400-2600
Answer: Option
Explanation:
No answer description is available. Let's discuss.

3.
Hollow refractory bricks are made by
slip casting
hand moulding
pressing/machine moulding
extrusion
Answer: Option
Explanation:
No answer description is available. Let's discuss.

4.
Quartz is
stable form of silica upto 870°C.
converted to tridymite on firing between 870 to 1470°C.
transformed to crystoballite on heating above 1470°C.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.

5.
An indication of degree of firing in silica brick is its
specific gravity
fusion point
RUL
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.