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Chemical Engineering - Refractory Technology

Exercise : Refractory Technology - Section 2
6.
Which is the most stable crystalline form of silica at room temperature ?
Quartz
Cristobalite
Tridymite
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Silica refractories
crack when subjected to sudden change of temperature.
can not be used in the dome of hot blast stoves.
have lower thermal conductivity than fireclay bricks.
all (a), (b) and (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
1520
1630
1670
1730
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
Which of the following is not an acidic refractory ?
Silica bricks
Fireclay bricks
Bauxite bricks
Magnesia bricks
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Insulating refractories should have
high porosity
low thermal conductivity
both (a) and (b)
neither (a) not (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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